TreeMap

sealed class TreeMap[K, V] extends AbstractMap[K, V] with SortedMap[K, V] with SortedMapOps[K, V, [K, V] =>> TreeMap[K, V], TreeMap[K, V]] with StrictOptimizedIterableOps[(K, V), [A] =>> Iterable[A], TreeMap[K, V]] with StrictOptimizedMapOps[K, V, [K, V] =>> Map[K, V], TreeMap[K, V]] with StrictOptimizedSortedMapOps[K, V, [K, V] =>> TreeMap[K, V], TreeMap[K, V]] with SortedMapFactoryDefaults[K, V, [K, V] =>> TreeMap[K, V], [A] =>> Iterable[A], [K, V] =>> Map[K, V]] with DefaultSerializable

A mutable sorted map implemented using a mutable red-black tree as underlying data structure.

Type Params
K

the type of the keys contained in this tree map.

V

the type of the values associated with the keys.

Value Params
ordering

the implicit ordering used to compare objects of type A.

Companion
object
Source
TreeMap.scala
trait StrictOptimizedSortedMapOps[K, V, [K, V] =>> TreeMap[K, V], TreeMap[K, V]]
trait StrictOptimizedMapOps[K, V, [K, V] =>> Map[K, V], TreeMap[K, V]]
trait StrictOptimizedIterableOps[(K, V), [A] =>> Iterable[A], TreeMap[K, V]]
trait SortedMap[K, V]
trait SortedMapOps[K, V, [K, V] =>> TreeMap[K, V], TreeMap[K, V]]
trait SortedMap[K, V]
trait SortedMapFactoryDefaults[K, V, [K, V] =>> TreeMap[K, V], [A] =>> Iterable[A], [K, V] =>> Map[K, V]]
trait SortedMapOps[K, V, [K, V] =>> TreeMap[K, V], TreeMap[K, V]]
trait SortedOps[K, TreeMap[K, V]]
class AbstractMap[K, V]
trait Map[K, V]
trait MapOps[K, V, [K, V] =>> Map[K, V], TreeMap[K, V]]
trait Shrinkable[K]
trait Builder[(K, V), TreeMap[K, V]]
trait Growable[(K, V)]
trait Clearable
trait Cloneable[TreeMap[K, V]]
trait Cloneable
trait Iterable[(K, V)]
class AbstractMap[K, V]
trait Map[K, V]
trait Equals
trait MapFactoryDefaults[K, V, [K, V] =>> Map[K, V], [A] =>> Iterable[A]]
trait MapOps[K, V, [K, V] =>> Map[K, V], TreeMap[K, V]]
trait K => V
class AbstractIterable[(K, V)]
trait Iterable[(K, V)]
trait IterableFactoryDefaults[(K, V), [A] =>> Iterable[A]]
trait IterableOps[(K, V), [A] =>> Iterable[A], TreeMap[K, V]]
trait IterableOnceOps[(K, V), [A] =>> Iterable[A], TreeMap[K, V]]
trait IterableOnce[(K, V)]
class Object
trait Matchable
class Any

Value members

Constructors

def this(implicit ord: Ordering[K])

Creates an empty TreeMap.

Creates an empty TreeMap.

Value Params
ord

the implicit ordering used to compare objects of type K.

Returns

an empty TreeMap.

Source
TreeMap.scala

Concrete methods

def addOne(elem: (K, V)): TreeMap[K, V]
override def clear(): Unit
Definition Classes
Source
TreeMap.scala
override def contains(key: K): Boolean
Definition Classes
Source
TreeMap.scala
override def foreach[U](f: (K, V) => U): Unit
Definition Classes
Source
TreeMap.scala
override def foreachEntry[U](f: (K, V) => U): Unit
Definition Classes
Source
TreeMap.scala
def get(key: K): Option[V]
override def head: (K, V)
Definition Classes
Source
TreeMap.scala
override def isEmpty: Boolean
Definition Classes
Source
TreeMap.scala
def iteratorFrom(start: K): Iterator[(K, V)]
override def keyStepper[S <: Stepper[_]](implicit shape: StepperShape[K, S]): S & EfficientSplit
Definition Classes
Source
TreeMap.scala
override def keysIterator: Iterator[K]
Definition Classes
Source
TreeMap.scala
override def knownSize: Int
Definition Classes
Source
TreeMap.scala
override def last: (K, V)
Definition Classes
Source
TreeMap.scala
override def maxBefore(key: K): Option[(K, V)]
Definition Classes
Source
TreeMap.scala
override def minAfter(key: K): Option[(K, V)]
Definition Classes
Source
TreeMap.scala
def rangeImpl(from: Option[K], until: Option[K]): TreeMap[K, V]

Creates a ranged projection of this map.

Creates a ranged projection of this map. Any mutations in the ranged projection will update the original map and vice versa.

Only entries with keys between this projection's key range will ever appear as elements of this map, independently of whether the entries are added through the original map or through this view. That means that if one inserts a key-value in a view whose key is outside the view's bounds, calls to get or contains will _not_ consider the newly added entry. Mutations are always reflected in the original map, though.

Value Params
from

the lower bound (inclusive) of this projection wrapped in a Some, or None if there is no lower bound.

until

the upper bound (exclusive) of this projection wrapped in a Some, or None if there is no upper bound.

Source
TreeMap.scala
override def size: Int
Definition Classes
Source
TreeMap.scala
override def sortedMapFactory: SortedMapFactory[[K, V] =>> TreeMap[K, V]]
Definition Classes
Source
TreeMap.scala
override def stepper[S <: Stepper[_]](implicit shape: StepperShape[(K, V), S]): S & EfficientSplit
Definition Classes
Source
TreeMap.scala
def subtractOne(elem: K): TreeMap[K, V]
override def valueStepper[S <: Stepper[_]](implicit shape: StepperShape[V, S]): S & EfficientSplit
Definition Classes
Source
TreeMap.scala
override def valuesIterator: Iterator[V]
Definition Classes
Source
TreeMap.scala
override def valuesIteratorFrom(start: K): Iterator[V]
Definition Classes
Source
TreeMap.scala

Inherited methods

final override def ++[V2 >: V](xs: IterableOnce[(K, V2)]): TreeMap[K, V2]

Alias for concat

Alias for concat

Definition Classes
Inherited from
SortedMapOps
Source
SortedMap.scala
final def ++[B >: (K, V)](suffix: IterableOnce[B]): Iterable[B]

Alias for concat

Alias for concat

Inherited from
IterableOps
Source
Iterable.scala
final def ++=(xs: IterableOnce[(K, V)]): TreeMap[K, V]

Alias for addAll

Alias for addAll

Inherited from
Growable
Source
Growable.scala
final def +=(elem: (K, V)): TreeMap[K, V]

Alias for addOne

Alias for addOne

Inherited from
Growable
Source
Growable.scala
final def --=(xs: IterableOnce[K]): TreeMap[K, V]

Alias for subtractAll

Alias for subtractAll

Inherited from
Shrinkable
Source
Shrinkable.scala
final def -=(elem: K): TreeMap[K, V]

Alias for subtractOne

Alias for subtractOne

Inherited from
Shrinkable
Source
Shrinkable.scala
def addAll(xs: IterableOnce[(K, V)]): TreeMap[K, V]

Adds all elements produced by an IterableOnce to this growable collection.

Adds all elements produced by an IterableOnce to this growable collection.

Value Params
xs

the IterableOnce producing the elements to add.

Returns

the growable collection itself.

Inherited from
Growable
Source
Growable.scala
override def addString(sb: StringBuilder, start: String, sep: String, end: String): StringBuilder
Definition Classes
Inherited from
MapOps
Source
Map.scala

Appends all elements of this collection to a string builder.

Appends all elements of this collection to a string builder. The written text consists of the string representations (w.r.t. the method toString) of all elements of this collection without any separator string.

Example:

scala> val a = List(1,2,3,4)
a: List[Int] = List(1, 2, 3, 4)

scala> val b = new StringBuilder()
b: StringBuilder =

scala> val h = a.addString(b)
h: StringBuilder = 1234
Value Params
b

the string builder to which elements are appended.

Returns

the string builder b to which elements were appended.

Inherited from
IterableOnceOps
Source
IterableOnce.scala

Appends all elements of this collection to a string builder using a separator string.

Appends all elements of this collection to a string builder using a separator string. The written text consists of the string representations (w.r.t. the method toString) of all elements of this collection, separated by the string sep.

Example:

scala> val a = List(1,2,3,4)
a: List[Int] = List(1, 2, 3, 4)

scala> val b = new StringBuilder()
b: StringBuilder =

scala> a.addString(b, ", ")
res0: StringBuilder = 1, 2, 3, 4
Value Params
b

the string builder to which elements are appended.

sep

the separator string.

Returns

the string builder b to which elements were appended.

Inherited from
IterableOnceOps
Source
IterableOnce.scala

Composes this partial function with another partial function that gets applied to results of this partial function.

Composes this partial function with another partial function that gets applied to results of this partial function.

Note that calling isDefinedAt on the resulting partial function may apply the first partial function and execute its side effect. It is highly recommended to call applyOrElse instead of isDefinedAt / apply for efficiency.

Type Params
C

the result type of the transformation function.

Value Params
k

the transformation function

Returns

a partial function with the domain of this partial function narrowed by other partial function, which maps arguments x to k(this(x)).

Inherited from
PartialFunction
Source
PartialFunction.scala
override def andThen[C](k: V => C): PartialFunction[K, C]

Composes this partial function with a transformation function that gets applied to results of this partial function.

Composes this partial function with a transformation function that gets applied to results of this partial function.

If the runtime type of the function is a PartialFunction then the other andThen method is used (note its cautions).

Type Params
C

the result type of the transformation function.

Value Params
k

the transformation function

Returns

a partial function with the domain of this partial function, possibly narrowed by the specified function, which maps arguments x to k(this(x)).

Definition Classes
Inherited from
PartialFunction
Source
PartialFunction.scala
@throws(scala.throws.$lessinit$greater$default$1[scala.NoSuchElementException])
def apply(key: K): V

Retrieves the value which is associated with the given key.

Retrieves the value which is associated with the given key. This method invokes the default method of the map if there is no mapping from the given key to a value. Unless overridden, the default method throws a NoSuchElementException.

Value Params
key

the key

Returns

the value associated with the given key, or the result of the map's default method, if none exists.

Inherited from
MapOps
Source
Map.scala
override def applyOrElse[K1 <: K, V1 >: V](x: K1, default: K1 => V1): V1
Definition Classes
Inherited from
MapOps
Source
Map.scala
def canEqual(that: Any): Boolean
Inherited from
Map
Source
Map.scala
override def clone(): TreeMap[K, V]
Definition Classes
Inherited from
MapOps
Source
Map.scala
override def collect[K2, V2](pf: PartialFunction[(K, V), (K2, V2)]): Map[K2, V2]
override def collect[K2, V2](pf: PartialFunction[(K, V), (K2, V2)])(implicit @implicitNotFound ordering: Ordering[K2]): TreeMap[K2, V2]
def collectFirst[B](pf: PartialFunction[(K, V), B]): Option[B]

Finds the first element of the collection for which the given partial function is defined, and applies the partial function to it.

Finds the first element of the collection for which the given partial function is defined, and applies the partial function to it.

Note: may not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered.

Value Params
pf

the partial function

Returns

an option value containing pf applied to the first value for which it is defined, or None if none exists.

Example

Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)

Inherited from
IterableOnceOps
Source
IterableOnce.scala

Composes another partial function k with this partial function so that this partial function gets applied to results of k.

Composes another partial function k with this partial function so that this partial function gets applied to results of k.

Note that calling isDefinedAt on the resulting partial function may apply the first partial function and execute its side effect. It is highly recommended to call applyOrElse instead of isDefinedAt / apply for efficiency.

Type Params
R

the parameter type of the transformation function.

Value Params
k

the transformation function

Returns

a partial function with the domain of other partial function narrowed by this partial function, which maps arguments x to this(k(x)).

Inherited from
PartialFunction
Source
PartialFunction.scala
def compose[A](g: A => K): A => V

Composes two instances of Function1 in a new Function1, with this function applied last.

Composes two instances of Function1 in a new Function1, with this function applied last.

Type Params
A

the type to which function g can be applied

Value Params
g

a function A => T1

Returns

a new function f such that f(x) == apply(g(x))

Inherited from
Function1
Source
Function1.scala
def concat[B >: (K, V)](suffix: IterableOnce[B]): Iterable[B]

Returns a new iterable collection containing the elements from the left hand operand followed by the elements from the right hand operand.

Returns a new iterable collection containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the iterable collection is the most specific superclass encompassing the element types of the two operands.

Type Params
B

the element type of the returned collection.

Value Params
suffix

the traversable to append.

Returns

a new iterable collection which contains all elements of this iterable collection followed by all elements of suffix.

Inherited from
IterableOps
Source
Iterable.scala
def copyToArray[B >: (K, V)](xs: Array[B], start: Int, len: Int): Int

Copy elements to an array, returning the number of elements written.

Copy elements to an array, returning the number of elements written.

Fills the given array xs starting at index start with at most len elements of this collection.

Copying will stop once either all the elements of this collection have been copied, or the end of the array is reached, or len elements have been copied.

Type Params
B

the type of the elements of the array.

Value Params
len

the maximal number of elements to copy.

start

the starting index of xs.

xs

the array to fill.

Returns

the number of elements written to the array

Note

Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
@deprecatedOverriding("This should always forward to the 3-arg version of this method", since = "2.13.4")
def copyToArray[B >: (K, V)](xs: Array[B], start: Int): Int

Copy elements to an array, returning the number of elements written.

Copy elements to an array, returning the number of elements written.

Fills the given array xs starting at index start with values of this collection.

Copying will stop once either all the elements of this collection have been copied, or the end of the array is reached.

Type Params
B

the type of the elements of the array.

Value Params
start

the starting index of xs.

xs

the array to fill.

Returns

the number of elements written to the array

Note

Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
@deprecatedOverriding("This should always forward to the 3-arg version of this method", since = "2.13.4")
def copyToArray[B >: (K, V)](xs: Array[B]): Int

Copy elements to an array, returning the number of elements written.

Copy elements to an array, returning the number of elements written.

Fills the given array xs starting at index start with values of this collection.

Copying will stop once either all the elements of this collection have been copied, or the end of the array is reached.

Type Params
B

the type of the elements of the array.

Value Params
xs

the array to fill.

Returns

the number of elements written to the array

Note

Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def corresponds[B](that: IterableOnce[B])(p: ((K, V), B) => Boolean): Boolean

Tests whether every element of this collection's iterator relates to the corresponding element of another collection by satisfying a test predicate.

Tests whether every element of this collection's iterator relates to the corresponding element of another collection by satisfying a test predicate.

Note: will not terminate for infinite-sized collections.

Type Params
B

the type of the elements of that

Value Params
p

the test predicate, which relates elements from both collections

that

the other collection

Returns

true if both collections have the same length and p(x, y) is true for all corresponding elements x of this iterator and y of that, otherwise false

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def count(p: (K, V) => Boolean): Int

Counts the number of elements in the collection which satisfy a predicate.

Counts the number of elements in the collection which satisfy a predicate.

Note: will not terminate for infinite-sized collections.

Value Params
p

the predicate used to test elements.

Returns

the number of elements satisfying the predicate p.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
@throws(scala.throws.$lessinit$greater$default$1[scala.NoSuchElementException])
def default(key: K): V

Defines the default value computation for the map, returned when a key is not found The method implemented here throws an exception, but it might be overridden in subclasses.

Defines the default value computation for the map, returned when a key is not found The method implemented here throws an exception, but it might be overridden in subclasses.

Value Params
key

the given key value for which a binding is missing.

Inherited from
MapOps
Source
Map.scala
def drop(n: Int): TreeMap[K, V]
Inherited from
IterableOps
Source
Iterable.scala
override def dropRight(n: Int): TreeMap[K, V]

The rest of the collection without its n last elements.

The rest of the collection without its n last elements. For linear, immutable collections this should avoid making a copy.

Note: Even when applied to a view or a lazy collection it will always force the elements.

Definition Classes
Inherited from
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
def dropWhile(p: (K, V) => Boolean): TreeMap[K, V]
Inherited from
IterableOps
Source
Iterable.scala

Returns an extractor object with a unapplySeq method, which extracts each element of a sequence data.

Returns an extractor object with a unapplySeq method, which extracts each element of a sequence data.

Example

val firstChar: String => Option[Char] = _.headOption
Seq("foo", "bar", "baz") match {
  case firstChar.unlift.elementWise(c0, c1, c2) =>
    println(s"$c0, $c1, $c2") // Output: f, b, b
}
Inherited from
PartialFunction
Source
PartialFunction.scala
override def empty: TreeMap[K, V]
override def equals(that: Any): Boolean
Definition Classes
SortedMap -> Map -> Equals -> Any
Inherited from
SortedMap
Source
SortedMap.scala
def exists(p: (K, V) => Boolean): Boolean

Tests whether a predicate holds for at least one element of this collection.

Tests whether a predicate holds for at least one element of this collection.

Note: may not terminate for infinite-sized collections.

Value Params
p

the predicate used to test elements.

Returns

true if the given predicate p is satisfied by at least one element of this collection, otherwise false

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def filterInPlace(p: (K, V) => Boolean): TreeMap[K, V]

Retains only those mappings for which the predicate p returns true.

Retains only those mappings for which the predicate p returns true.

Value Params
p

The test predicate

Inherited from
MapOps
Source
Map.scala
def find(p: (K, V) => Boolean): Option[(K, V)]

Finds the first element of the collection satisfying a predicate, if any.

Finds the first element of the collection satisfying a predicate, if any.

Note: may not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered.

Value Params
p

the predicate used to test elements.

Returns

an option value containing the first element in the collection that satisfies p, or None if none exists.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def firstKey: K
Inherited from
SortedMapOps
Source
SortedMap.scala
override def flatMap[K2, V2](f: (K, V) => IterableOnce[(K2, V2)]): Map[K2, V2]
override def flatMap[K2, V2](f: (K, V) => IterableOnce[(K2, V2)])(implicit @implicitNotFound ordering: Ordering[K2]): TreeMap[K2, V2]
override def flatten[B](implicit toIterableOnce: (K, V) => IterableOnce[B]): Iterable[B]
def fold[A1 >: (K, V)](z: A1)(op: (A1, A1) => A1): A1

Folds the elements of this collection using the specified associative binary operator.

Folds the elements of this collection using the specified associative binary operator. The default implementation in IterableOnce is equivalent to foldLeft but may be overridden for more efficient traversal orders.

The order in which operations are performed on elements is unspecified and may be nondeterministic.

Note: will not terminate for infinite-sized collections.

Type Params
A1

a type parameter for the binary operator, a supertype of A.

Value Params
op

a binary operator that must be associative.

z

a neutral element for the fold operation; may be added to the result an arbitrary number of times, and must not change the result (e.g., Nil for list concatenation, 0 for addition, or 1 for multiplication).

Returns

the result of applying the fold operator op between all the elements and z, or z if this collection is empty.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def foldLeft[B](z: B)(op: (B, (K, V)) => B): B

Applies a binary operator to a start value and all elements of this collection, going left to right.

Applies a binary operator to a start value and all elements of this collection, going left to right.

Note: will not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.

Type Params
B

the result type of the binary operator.

Value Params
op

the binary operator.

z

the start value.

Returns

the result of inserting op between consecutive elements of this collection, going left to right with the start value z on the left: op(...op(z, x1), x2, ..., xn) where x1, ..., xn are the elements of this collection. Returns z if this collection is empty.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def foldRight[B](z: B)(op: ((K, V), B) => B): B

Applies a binary operator to all elements of this collection and a start value, going right to left.

Applies a binary operator to all elements of this collection and a start value, going right to left.

Note: will not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.

Type Params
B

the result type of the binary operator.

Value Params
op

the binary operator.

z

the start value.

Returns

the result of inserting op between consecutive elements of this collection, going right to left with the start value z on the right: op(x1, op(x2, ... op(xn, z)...)) where x1, ..., xn are the elements of this collection. Returns z if this collection is empty.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def forall(p: (K, V) => Boolean): Boolean

Tests whether a predicate holds for all elements of this collection.

Tests whether a predicate holds for all elements of this collection.

Note: may not terminate for infinite-sized collections.

Value Params
p

the predicate used to test elements.

Returns

true if this collection is empty or the given predicate p holds for all elements of this collection, otherwise false.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
override protected def fromSpecific(coll: IterableOnce[(K, V)]): TreeMap[K, V]
def getOrElse[V1 >: V](key: K, default: => V1): V1

Returns the value associated with a key, or a default value if the key is not contained in the map.

Returns the value associated with a key, or a default value if the key is not contained in the map.

Type Params
V1

the result type of the default computation.

Value Params
default

a computation that yields a default value in case no binding for key is found in the map.

key

the key.

Returns

the value associated with key if it exists, otherwise the result of the default computation.

Inherited from
MapOps
Source
Map.scala
def getOrElseUpdate(key: K, op: => V): V

If given key is already in this map, returns associated value.

If given key is already in this map, returns associated value.

Otherwise, computes value from given expression op, stores with key in map and returns that value.

Concurrent map implementations may evaluate the expression op multiple times, or may evaluate op without inserting the result.

Value Params
key

the key to test

op

the computation yielding the value to associate with key, if key is previously unbound.

Returns

the value associated with key (either previously or as a result of executing the method).

Inherited from
MapOps
Source
Map.scala
def groupBy[K](f: (K, V) => K): Map[K, TreeMap[K, V]]

Partitions this iterable collection into a map of iterable collections according to some discriminator function.

Partitions this iterable collection into a map of iterable collections according to some discriminator function.

Note: Even when applied to a view or a lazy collection it will always force the elements.

Type Params
K

the type of keys returned by the discriminator function.

Value Params
f

the discriminator function.

Returns

A map from keys to iterable collections such that the following invariant holds:

(xs groupBy f)(k) = xs filter (x => f(x) == k)

That is, every key k is bound to a iterable collection of those elements x for which f(x) equals k.

Inherited from
IterableOps
Source
Iterable.scala
def groupMap[K, B](key: (K, V) => K)(f: (K, V) => B): Map[K, Iterable[B]]

Partitions this iterable collection into a map of iterable collections according to a discriminator function key.

Partitions this iterable collection into a map of iterable collections according to a discriminator function key. Each element in a group is transformed into a value of type B using the value function.

It is equivalent to groupBy(key).mapValues(_.map(f)), but more efficient.

case class User(name: String, age: Int)

def namesByAge(users: Seq[User]): Map[Int, Seq[String]] =
  users.groupMap(_.age)(_.name)

Note: Even when applied to a view or a lazy collection it will always force the elements.

Type Params
B

the type of values returned by the transformation function

K

the type of keys returned by the discriminator function

Value Params
f

the element transformation function

key

the discriminator function

Inherited from
IterableOps
Source
Iterable.scala
def groupMapReduce[K, B](key: (K, V) => K)(f: (K, V) => B)(reduce: (B, B) => B): Map[K, B]

Partitions this iterable collection into a map according to a discriminator function key.

Partitions this iterable collection into a map according to a discriminator function key. All the values that have the same discriminator are then transformed by the f function and then reduced into a single value with the reduce function.

It is equivalent to groupBy(key).mapValues(_.map(f).reduce(reduce)), but more efficient.

def occurrences[A](as: Seq[A]): Map[A, Int] =
  as.groupMapReduce(identity)(_ => 1)(_ + _)

Note: Even when applied to a view or a lazy collection it will always force the elements.

Inherited from
IterableOps
Source
Iterable.scala
def grouped(size: Int): Iterator[TreeMap[K, V]]

Partitions elements in fixed size iterable collections.

Partitions elements in fixed size iterable collections.

Value Params
size

the number of elements per group

Returns

An iterator producing iterable collections of size size, except the last will be less than size size if the elements don't divide evenly.

See also
Inherited from
IterableOps
Source
Iterable.scala
override def hashCode(): Int
Definition Classes
Map -> Any
Inherited from
Map
Source
Map.scala
def headOption: Option[(K, V)]

Optionally selects the first element.

Optionally selects the first element.

Note: might return different results for different runs, unless the underlying collection type is ordered.

Returns

the first element of this iterable collection if it is nonempty, None if it is empty.

Inherited from
IterableOps
Source
Iterable.scala
def init: TreeMap[K, V]

The initial part of the collection without its last element.

The initial part of the collection without its last element.

Note: Even when applied to a view or a lazy collection it will always force the elements.

Inherited from
IterableOps
Source
Iterable.scala

Iterates over the inits of this iterable collection.

Iterates over the inits of this iterable collection. The first value will be this iterable collection and the final one will be an empty iterable collection, with the intervening values the results of successive applications of init.

Note: Even when applied to a view or a lazy collection it will always force the elements.

Returns

an iterator over all the inits of this iterable collection

Example

List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)

Inherited from
IterableOps
Source
Iterable.scala
def isDefinedAt(key: K): Boolean

Tests whether this map contains a binding for a key.

Tests whether this map contains a binding for a key. This method, which implements an abstract method of trait PartialFunction, is equivalent to contains.

Value Params
key

the key

Returns

true if there is a binding for key in this map, false otherwise.

Inherited from
MapOps
Source
Map.scala
Definition Classes
Inherited from
IterableOps
Source
Iterable.scala
override def iterableFactory: IterableFactory[[A] =>> Iterable[A]]
Definition Classes
Inherited from
Iterable
Source
Iterable.scala
override def keySet: SortedSet[K]
Definition Classes
Inherited from
SortedMapOps
Source
SortedMap.scala
def keys: Iterable[K]

Collects all keys of this map in an iterable collection.

Collects all keys of this map in an iterable collection.

Returns

the keys of this map as an iterable.

Inherited from
MapOps
Source
Map.scala
def lastKey: K
Inherited from
SortedMapOps
Source
SortedMap.scala
def lastOption: Option[(K, V)]

Optionally selects the last element.

Optionally selects the last element.

Note: might return different results for different runs, unless the underlying collection type is ordered.

Returns

the last element of this iterable collection$ if it is nonempty, None if it is empty.

Inherited from
IterableOps
Source
Iterable.scala
def lazyZip[B](that: Iterable[B]): LazyZip2[(K, V), B, TreeMap[K, V]]

Analogous to zip except that the elements in each collection are not consumed until a strict operation is invoked on the returned LazyZip2 decorator.

Analogous to zip except that the elements in each collection are not consumed until a strict operation is invoked on the returned LazyZip2 decorator.

Calls to lazyZip can be chained to support higher arities (up to 4) without incurring the expense of constructing and deconstructing intermediary tuples.

val xs = List(1, 2, 3)
val res = (xs lazyZip xs lazyZip xs lazyZip xs).map((a, b, c, d) => a + b + c + d)
// res == List(4, 8, 12)
Type Params
B

the type of the second element in each eventual pair

Value Params
that

the iterable providing the second element of each eventual pair

Returns

a decorator LazyZip2 that allows strict operations to be performed on the lazily evaluated pairs or chained calls to lazyZip. Implicit conversion to Iterable[(A, B)] is also supported.

Inherited from
Iterable
Source
Iterable.scala
def lift: K => Option[V]

Turns this partial function into a plain function returning an Option result.

Turns this partial function into a plain function returning an Option result.

Returns

a function that takes an argument x to Some(this(x)) if this is defined for x, and to None otherwise.

See also

Function.unlift

Inherited from
PartialFunction
Source
PartialFunction.scala
override def map[K2, V2](f: (K, V) => (K2, V2)): Map[K2, V2]
override def map[K2, V2](f: (K, V) => (K2, V2))(implicit @implicitNotFound ordering: Ordering[K2]): TreeMap[K2, V2]
override def mapFactory: MapFactory[[K, V] =>> Map[K, V]]
Definition Classes
Map -> Map -> MapOps
Inherited from
Map
Source
Map.scala
def mapResult[NewTo](f: TreeMap[K, V] => NewTo): Builder[(K, V), NewTo]

A builder resulting from this builder my mapping the result using f.

A builder resulting from this builder my mapping the result using f.

Inherited from
Builder
Source
Builder.scala
def mapValuesInPlace(f: (K, V) => V): TreeMap[K, V]

Applies a transformation function to all values contained in this map.

Applies a transformation function to all values contained in this map. The transformation function produces new values from existing keys associated values.

Value Params
f

the transformation to apply

Returns

the map itself.

Inherited from
MapOps
Source
Map.scala
def max[B >: (K, V)](implicit ord: Ordering[B]): (K, V)

Finds the largest element.

Finds the largest element.

Note: will not terminate for infinite-sized collections.

Type Params
B

The type over which the ordering is defined.

Value Params
ord

An ordering to be used for comparing elements.

Returns

the largest element of this collection with respect to the ordering ord.

Throws
UnsupportedOperationException

if this collection is empty.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def maxBy[B](f: (K, V) => B)(implicit cmp: Ordering[B]): (K, V)

Finds the first element which yields the largest value measured by function f.

Finds the first element which yields the largest value measured by function f.

Note: will not terminate for infinite-sized collections.

Type Params
B

The result type of the function f.

Value Params
cmp

An ordering to be used for comparing elements.

f

The measuring function.

Returns

the first element of this collection with the largest value measured by function f with respect to the ordering cmp.

Throws
UnsupportedOperationException

if this collection is empty.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def maxByOption[B](f: (K, V) => B)(implicit cmp: Ordering[B]): Option[(K, V)]

Finds the first element which yields the largest value measured by function f.

Finds the first element which yields the largest value measured by function f.

Note: will not terminate for infinite-sized collections.

Type Params
B

The result type of the function f.

Value Params
cmp

An ordering to be used for comparing elements.

f

The measuring function.

Returns

an option value containing the first element of this collection with the largest value measured by function f with respect to the ordering cmp.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def maxOption[B >: (K, V)](implicit ord: Ordering[B]): Option[(K, V)]

Finds the largest element.

Finds the largest element.

Note: will not terminate for infinite-sized collections.

Type Params
B

The type over which the ordering is defined.

Value Params
ord

An ordering to be used for comparing elements.

Returns

an option value containing the largest element of this collection with respect to the ordering ord.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def min[B >: (K, V)](implicit ord: Ordering[B]): (K, V)

Finds the smallest element.

Finds the smallest element.

Note: will not terminate for infinite-sized collections.

Type Params
B

The type over which the ordering is defined.

Value Params
ord

An ordering to be used for comparing elements.

Returns

the smallest element of this collection with respect to the ordering ord.

Throws
UnsupportedOperationException

if this collection is empty.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def minBy[B](f: (K, V) => B)(implicit cmp: Ordering[B]): (K, V)

Finds the first element which yields the smallest value measured by function f.

Finds the first element which yields the smallest value measured by function f.

Note: will not terminate for infinite-sized collections.

Type Params
B

The result type of the function f.

Value Params
cmp

An ordering to be used for comparing elements.

f

The measuring function.

Returns

the first element of this collection with the smallest value measured by function f with respect to the ordering cmp.

Throws
UnsupportedOperationException

if this collection is empty.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def minByOption[B](f: (K, V) => B)(implicit cmp: Ordering[B]): Option[(K, V)]

Finds the first element which yields the smallest value measured by function f.

Finds the first element which yields the smallest value measured by function f.

Note: will not terminate for infinite-sized collections.

Type Params
B

The result type of the function f.

Value Params
cmp

An ordering to be used for comparing elements.

f

The measuring function.

Returns

an option value containing the first element of this collection with the smallest value measured by function f with respect to the ordering cmp.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def minOption[B >: (K, V)](implicit ord: Ordering[B]): Option[(K, V)]

Finds the smallest element.

Finds the smallest element.

Note: will not terminate for infinite-sized collections.

Type Params
B

The type over which the ordering is defined.

Value Params
ord

An ordering to be used for comparing elements.

Returns

an option value containing the smallest element of this collection with respect to the ordering ord.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
final def mkString: String

Displays all elements of this collection in a string.

Displays all elements of this collection in a string.

Delegates to addString, which can be overridden.

Returns

a string representation of this collection. In the resulting string the string representations (w.r.t. the method toString) of all elements of this collection follow each other without any separator string.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
final def mkString(sep: String): String

Displays all elements of this collection in a string using a separator string.

Displays all elements of this collection in a string using a separator string.

Delegates to addString, which can be overridden.

Value Params
sep

the separator string.

Returns

a string representation of this collection. In the resulting string the string representations (w.r.t. the method toString) of all elements of this collection are separated by the string sep.

Example

List(1, 2, 3).mkString("|") = "1|2|3"

Inherited from
IterableOnceOps
Source
IterableOnce.scala
final def mkString(start: String, sep: String, end: String): String

Displays all elements of this collection in a string using start, end, and separator strings.

Displays all elements of this collection in a string using start, end, and separator strings.

Delegates to addString, which can be overridden.

Value Params
end

the ending string.

sep

the separator string.

start

the starting string.

Returns

a string representation of this collection. The resulting string begins with the string start and ends with the string end. Inside, the string representations (w.r.t. the method toString) of all elements of this collection are separated by the string sep.

Example

List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"

Inherited from
IterableOnceOps
Source
IterableOnce.scala
override protected def newSpecificBuilder: Builder[(K, V), TreeMap[K, V]]
@deprecatedOverriding("nonEmpty is defined as !isEmpty; override isEmpty instead", "2.13.0")

Tests whether the collection is not empty.

Tests whether the collection is not empty.

Returns

true if the collection contains at least one element, false otherwise.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def orElse[A1 <: K, B1 >: V](that: PartialFunction[A1, B1]): PartialFunction[A1, B1]

Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.

Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.

Type Params
A1

the argument type of the fallback function

B1

the result type of the fallback function

Value Params
that

the fallback function

Returns

a partial function which has as domain the union of the domains of this partial function and that. The resulting partial function takes x to this(x) where this is defined, and to that(x) where it is not.

Inherited from
PartialFunction
Source
PartialFunction.scala
override def partitionMap[A1, A2](f: (K, V) => Either[A1, A2]): (Iterable[A1], Iterable[A2])
def product[B >: (K, V)](implicit num: Numeric[B]): B

Multiplies up the elements of this collection.

Multiplies up the elements of this collection.

Note: will not terminate for infinite-sized collections.

Type Params
B

the result type of the * operator.

Value Params
num

an implicit parameter defining a set of numeric operations which includes the * operator to be used in forming the product.

Returns

the product of all elements of this collection with respect to the * operator in num.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def put(key: K, value: V): Option[V]

Adds a new key/value pair to this map and optionally returns previously bound value.

Adds a new key/value pair to this map and optionally returns previously bound value. If the map already contains a mapping for the key, it will be overridden by the new value.

Value Params
key

the key to update

value

the new value

Returns

an option value containing the value associated with the key before the put operation was executed, or None if key was not defined in the map before.

Inherited from
MapOps
Source
Map.scala
def range(from: K, until: K): TreeMap[K, V]

Creates a ranged projection of this collection with both a lower-bound and an upper-bound.

Creates a ranged projection of this collection with both a lower-bound and an upper-bound.

Value Params
from

The lower-bound (inclusive) of the ranged projection.

until

The upper-bound (exclusive) of the ranged projection.

Inherited from
SortedOps
Source
SortedOps.scala
def rangeFrom(from: K): TreeMap[K, V]

Creates a ranged projection of this collection with no upper-bound.

Creates a ranged projection of this collection with no upper-bound.

Value Params
from

The lower-bound (inclusive) of the ranged projection.

Inherited from
SortedOps
Source
SortedOps.scala
def rangeTo(to: K): TreeMap[K, V]
Inherited from
SortedMapOps
Source
SortedMap.scala
def rangeUntil(until: K): TreeMap[K, V]

Creates a ranged projection of this collection with no lower-bound.

Creates a ranged projection of this collection with no lower-bound.

Value Params
until

The upper-bound (exclusive) of the ranged projection.

Inherited from
SortedOps
Source
SortedOps.scala
def reduce[B >: (K, V)](op: (B, B) => B): B

Reduces the elements of this collection using the specified associative binary operator.

Reduces the elements of this collection using the specified associative binary operator.

The order in which operations are performed on elements is unspecified and may be nondeterministic.

Type Params
B

A type parameter for the binary operator, a supertype of A.

Value Params
op

A binary operator that must be associative.

Returns

The result of applying reduce operator op between all the elements if the collection is nonempty.

Throws
UnsupportedOperationException

if this collection is empty.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def reduceLeft[B >: (K, V)](op: (B, (K, V)) => B): B

Applies a binary operator to all elements of this collection, going left to right.

Applies a binary operator to all elements of this collection, going left to right.

Note: will not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.

Type Params
B

the result type of the binary operator.

Value Params
op

the binary operator.

Returns

the result of inserting op between consecutive elements of this collection, going left to right: op( op( ... op(x1, x2) ..., xn-1), xn) where x1, ..., xn are the elements of this collection.

Throws
UnsupportedOperationException

if this collection is empty.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def reduceLeftOption[B >: (K, V)](op: (B, (K, V)) => B): Option[B]

Optionally applies a binary operator to all elements of this collection, going left to right.

Optionally applies a binary operator to all elements of this collection, going left to right.

Note: will not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.

Type Params
B

the result type of the binary operator.

Value Params
op

the binary operator.

Returns

an option value containing the result of reduceLeft(op) if this collection is nonempty, None otherwise.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def reduceOption[B >: (K, V)](op: (B, B) => B): Option[B]

Reduces the elements of this collection, if any, using the specified associative binary operator.

Reduces the elements of this collection, if any, using the specified associative binary operator.

The order in which operations are performed on elements is unspecified and may be nondeterministic.

Type Params
B

A type parameter for the binary operator, a supertype of A.

Value Params
op

A binary operator that must be associative.

Returns

An option value containing result of applying reduce operator op between all the elements if the collection is nonempty, and None otherwise.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def reduceRight[B >: (K, V)](op: ((K, V), B) => B): B

Applies a binary operator to all elements of this collection, going right to left.

Applies a binary operator to all elements of this collection, going right to left.

Note: will not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.

Type Params
B

the result type of the binary operator.

Value Params
op

the binary operator.

Returns

the result of inserting op between consecutive elements of this collection, going right to left: op(x1, op(x2, ..., op(xn-1, xn)...)) where x1, ..., xn are the elements of this collection.

Throws
UnsupportedOperationException

if this collection is empty.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def reduceRightOption[B >: (K, V)](op: ((K, V), B) => B): Option[B]

Optionally applies a binary operator to all elements of this collection, going right to left.

Optionally applies a binary operator to all elements of this collection, going right to left.

Note: will not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.

Type Params
B

the result type of the binary operator.

Value Params
op

the binary operator.

Returns

an option value containing the result of reduceRight(op) if this collection is nonempty, None otherwise.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def remove(key: K): Option[V]

Removes a key from this map, returning the value associated previously with that key as an option.

Removes a key from this map, returning the value associated previously with that key as an option.

Value Params
key

the key to be removed

Returns

an option value containing the value associated previously with key, or None if key was not defined in the map before.

Inherited from
MapOps
Source
Map.scala
def result(): TreeMap[K, V]
Inherited from
MapOps
Source
Map.scala
protected def reversed: Iterable[(K, V)]
def runWith[U](action: V => U): K => Boolean

Composes this partial function with an action function which gets applied to results of this partial function.

Composes this partial function with an action function which gets applied to results of this partial function. The action function is invoked only for its side effects; its result is ignored.

Note that expression pf.runWith(action)(x) is equivalent to

if(pf isDefinedAt x) { action(pf(x)); true } else false

except that runWith is implemented via applyOrElse and thus potentially more efficient. Using runWith avoids double evaluation of pattern matchers and guards for partial function literals.

Value Params
action

the action function

Returns

a function which maps arguments x to isDefinedAt(x). The resulting function runs action(this(x)) where this is defined.

See also

applyOrElse.

Inherited from
PartialFunction
Source
PartialFunction.scala
def scan[B >: (K, V)](z: B)(op: (B, B) => B): Iterable[B]

Computes a prefix scan of the elements of the collection.

Computes a prefix scan of the elements of the collection.

Note: The neutral element z may be applied more than once.

Type Params
B

element type of the resulting collection

Value Params
op

the associative operator for the scan

z

neutral element for the operator op

Returns

a new iterable collection containing the prefix scan of the elements in this iterable collection

Inherited from
IterableOps
Source
Iterable.scala
override def scanLeft[B](z: B)(op: (B, (K, V)) => B): Iterable[B]
def scanRight[B](z: B)(op: ((K, V), B) => B): Iterable[B]

Produces a collection containing cumulative results of applying the operator going right to left.

Produces a collection containing cumulative results of applying the operator going right to left. The head of the collection is the last cumulative result.

Note: will not terminate for infinite-sized collections.

Note: might return different results for different runs, unless the underlying collection type is ordered.

Note: Even when applied to a view or a lazy collection it will always force the elements.

Example:

List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)
Type Params
B

the type of the elements in the resulting collection

Value Params
op

the binary operator applied to the intermediate result and the element

z

the initial value

Returns

collection with intermediate results

Inherited from
IterableOps
Source
Iterable.scala
def sizeCompare(that: Iterable[_]): Int

Compares the size of this iterable collection to the size of another Iterable.

Compares the size of this iterable collection to the size of another Iterable.

Value Params
that

the Iterable whose size is compared with this iterable collection's size.

Returns

A value x where

x <  0       if this.size <  that.size
x == 0       if this.size == that.size
x >  0       if this.size >  that.size

The method as implemented here does not call size directly; its running time is O(this.size min that.size) instead of O(this.size + that.size). The method should be overridden if computing size is cheap and knownSize returns -1.

Inherited from
IterableOps
Source
Iterable.scala
def sizeCompare(otherSize: Int): Int

Compares the size of this iterable collection to a test value.

Compares the size of this iterable collection to a test value.

Value Params
otherSize

the test value that gets compared with the size.

Returns

A value x where

x <  0       if this.size <  otherSize
x == 0       if this.size == otherSize
x >  0       if this.size >  otherSize

The method as implemented here does not call size directly; its running time is O(size min otherSize) instead of O(size). The method should be overridden if computing size is cheap and knownSize returns -1.

See also
Inherited from
IterableOps
Source
Iterable.scala
final def sizeHint(coll: IterableOnce[_], delta: Int): Unit

Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta.

Gives a hint that one expects the result of this builder to have the same size as the given collection, plus some delta. This will provide a hint only if the collection has a known size Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

Value Params
coll

the collection which serves as a hint for the result's size.

delta

a correction to add to the coll.size to produce the size hint.

Inherited from
Builder
Source
Builder.scala
def sizeHint(size: Int): Unit

Gives a hint how many elements are expected to be added when the next result is called.

Gives a hint how many elements are expected to be added when the next result is called. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

Value Params
size

the hint how many elements will be added.

Inherited from
Builder
Source
Builder.scala
final def sizeHintBounded(size: Int, boundingColl: Iterable[_]): Unit

Gives a hint how many elements are expected to be added when the next result is called, together with an upper bound given by the size of some other collection.

Gives a hint how many elements are expected to be added when the next result is called, together with an upper bound given by the size of some other collection. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

Value Params
boundingColl

the bounding collection. If it is an IndexedSeqLike, then sizes larger than collection's size are reduced.

size

the hint how many elements will be added.

Inherited from
Builder
Source
Builder.scala

Returns a value class containing operations for comparing the size of this iterable collection to a test value.

Returns a value class containing operations for comparing the size of this iterable collection to a test value.

These operations are implemented in terms of sizeCompare(Int), and allow the following more readable usages:

this.sizeIs < size     // this.sizeCompare(size) < 0
this.sizeIs <= size    // this.sizeCompare(size) <= 0
this.sizeIs == size    // this.sizeCompare(size) == 0
this.sizeIs != size    // this.sizeCompare(size) != 0
this.sizeIs >= size    // this.sizeCompare(size) >= 0
this.sizeIs > size     // this.sizeCompare(size) > 0
Inherited from
IterableOps
Source
Iterable.scala
def slice(from: Int, until: Int): TreeMap[K, V]
Inherited from
IterableOps
Source
Iterable.scala
def sliding(size: Int, step: Int): Iterator[TreeMap[K, V]]

Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)

Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)

The returned iterator will be empty when called on an empty collection. The last element the iterator produces may be smaller than the window size when the original collection isn't exhausted by the window before it and its last element isn't skipped by the step before it.

Value Params
size

the number of elements per group

step

the distance between the first elements of successive groups

Returns

An iterator producing iterable collections of size size, except the last element (which may be the only element) will be smaller if there are fewer than size elements remaining to be grouped.

See also
Example

List(1, 2, 3, 4, 5).sliding(2, 2) = Iterator(List(1, 2), List(3, 4), List(5))

List(1, 2, 3, 4, 5, 6).sliding(2, 3) = Iterator(List(1, 2), List(4, 5))

Inherited from
IterableOps
Source
Iterable.scala
def sliding(size: Int): Iterator[TreeMap[K, V]]

Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)

Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)

An empty collection returns an empty iterator, and a non-empty collection containing fewer elements than the window size returns an iterator that will produce the original collection as its only element.

Value Params
size

the number of elements per group

Returns

An iterator producing iterable collections of size size, except for a non-empty collection with less than size elements, which returns an iterator that produces the source collection itself as its only element.

See also
Example

List().sliding(2) = empty iterator

List(1).sliding(2) = Iterator(List(1))

List(1, 2).sliding(2) = Iterator(List(1, 2))

List(1, 2, 3).sliding(2) = Iterator(List(1, 2), List(2, 3))

Inherited from
IterableOps
Source
Iterable.scala
override def splitAt(n: Int): (TreeMap[K, V], TreeMap[K, V])
Definition Classes
Inherited from
IterableOps
Source
Iterable.scala

Removes all elements produced by an iterator from this shrinkable collection.

Removes all elements produced by an iterator from this shrinkable collection.

Value Params
xs

the iterator producing the elements to remove.

Returns

the shrinkable collection itself

Inherited from
Shrinkable
Source
Shrinkable.scala
def sum[B >: (K, V)](implicit num: Numeric[B]): B

Sums up the elements of this collection.

Sums up the elements of this collection.

Note: will not terminate for infinite-sized collections.

Type Params
B

the result type of the + operator.

Value Params
num

an implicit parameter defining a set of numeric operations which includes the + operator to be used in forming the sum.

Returns

the sum of all elements of this collection with respect to the + operator in num.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def tail: TreeMap[K, V]

The rest of the collection without its first element.

The rest of the collection without its first element.

Inherited from
IterableOps
Source
Iterable.scala

Iterates over the tails of this iterable collection.

Iterates over the tails of this iterable collection. The first value will be this iterable collection and the final one will be an empty iterable collection, with the intervening values the results of successive applications of tail.

Returns

an iterator over all the tails of this iterable collection

Example

List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)

Inherited from
IterableOps
Source
Iterable.scala
def take(n: Int): TreeMap[K, V]
Inherited from
IterableOps
Source
Iterable.scala
override def takeRight(n: Int): TreeMap[K, V]

A collection containing the last n elements of this collection.

A collection containing the last n elements of this collection.

Note: Even when applied to a view or a lazy collection it will always force the elements.

Definition Classes
Inherited from
StrictOptimizedIterableOps
Source
StrictOptimizedIterableOps.scala
def takeWhile(p: (K, V) => Boolean): TreeMap[K, V]

Takes longest prefix of elements that satisfy a predicate.

Takes longest prefix of elements that satisfy a predicate.

Note: might return different results for different runs, unless the underlying collection type is ordered.

Value Params
p

The predicate used to test elements.

Returns

the longest prefix of this iterable collection whose elements all satisfy the predicate p.

Inherited from
IterableOps
Source
Iterable.scala
def to[C1](factory: Factory[(K, V), C1]): C1

Given a collection factory factory, convert this collection to the appropriate representation for the current element type A.

Given a collection factory factory, convert this collection to the appropriate representation for the current element type A. Example uses:

xs.to(List) xs.to(ArrayBuffer) xs.to(BitSet) // for xs: Iterable[Int]

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def toArray[B >: (K, V)](implicit evidence$1: ClassTag[B]): Array[B]

Convert collection to array.

Convert collection to array.

Implementation note: DO NOT call Array.from from this method.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
final def toBuffer[B >: (K, V)]: Buffer[B]
final def toIterable: TreeMap[K, V]
Inherited from
Iterable
Source
Iterable.scala
def toList: List[(K, V)]
def toMap[K, V](implicit ev: (K, V) <:< (K, V)): Map[K, V]
def toSeq: Seq[(K, V)]
Returns

This collection as a Seq[A]. This is equivalent to to(Seq) but might be faster.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
def toSet[B >: (K, V)]: Set[B]
override def toString(): String
Definition Classes
Map -> Function1 -> Iterable -> Any
Inherited from
Map
Source
Map.scala
def toVector: Vector[(K, V)]
def transpose[B](implicit asIterable: (K, V) => Iterable[B]): Iterable[Iterable[B]]

Transposes this iterable collection of iterable collections into a iterable collection of iterable collections.

Transposes this iterable collection of iterable collections into a iterable collection of iterable collections.

The resulting collection's type will be guided by the static type of iterable collection. For example:

val xs = List(
           Set(1, 2, 3),
           Set(4, 5, 6)).transpose
// xs == List(
//         List(1, 4),
//         List(2, 5),
//         List(3, 6))

val ys = Vector(
           List(1, 2, 3),
           List(4, 5, 6)).transpose
// ys == Vector(
//         Vector(1, 4),
//         Vector(2, 5),
//         Vector(3, 6))

Note: Even when applied to a view or a lazy collection it will always force the elements.

Type Params
B

the type of the elements of each iterable collection.

Value Params
asIterable

an implicit conversion which asserts that the element type of this iterable collection is an Iterable.

Returns

a two-dimensional iterable collection of iterable collections which has as nth row the nth column of this iterable collection.

Throws
IllegalArgumentException

if all collections in this iterable collection are not of the same size.

Inherited from
IterableOps
Source
Iterable.scala
def unapply(a: K): Option[V]

Tries to extract a B from an A in a pattern matching expression.

Tries to extract a B from an A in a pattern matching expression.

Inherited from
PartialFunction
Source
PartialFunction.scala
override def unsorted: Map[K, V]
Definition Classes
Inherited from
SortedMap
Source
SortedMap.scala
override def unzip[A1, A2](implicit asPair: (K, V) => (A1, A2)): (Iterable[A1], Iterable[A2])
override def unzip3[A1, A2, A3](implicit asTriple: (K, V) => (A1, A2, A3)): (Iterable[A1], Iterable[A2], Iterable[A3])
def update(key: K, value: V): Unit

Adds a new key/value pair to this map.

Adds a new key/value pair to this map. If the map already contains a mapping for the key, it will be overridden by the new value.

Value Params
key

The key to update

value

The new value

Inherited from
MapOps
Source
Map.scala
def updateWith(key: K)(remappingFunction: Option[V] => Option[V]): Option[V]

Update a mapping for the specified key and its current optionally-mapped value (Some if there is current mapping, None if not).

Update a mapping for the specified key and its current optionally-mapped value (Some if there is current mapping, None if not).

If the remapping function returns Some(v), the mapping is updated with the new value v. If the remapping function returns None, the mapping is removed (or remains absent if initially absent). If the function itself throws an exception, the exception is rethrown, and the current mapping is left unchanged.

Value Params
key

the key value

remappingFunction

a partial function that receives current optionally-mapped value and return a new mapping

Returns

the new value associated with the specified key

Inherited from
MapOps
Source
Map.scala

Collects all values of this map in an iterable collection.

Collects all values of this map in an iterable collection.

Returns

the values of this map as an iterable.

Inherited from
MapOps
Source
Map.scala
override def view: MapView[K, V]
Definition Classes
Inherited from
MapOps
Source
Map.scala
override def withDefault(d: K => V): SortedMap[K, V]

The same sorted map with a given default function.

The same sorted map with a given default function. Note: The default is only used for apply. Other methods like get, contains, iterator, keys, etc. are not affected by withDefault.

Invoking transformer methods (e.g. map) will not preserve the default value.

Value Params
d

the function mapping keys to values, used for non-present keys

Returns

a wrapper of the map with a default value

Definition Classes
Inherited from
SortedMap
Source
SortedMap.scala
override def withDefaultValue(d: V): SortedMap[K, V]

The same map with a given default value.

The same map with a given default value. Note: The default is only used for apply. Other methods like get, contains, iterator, keys, etc. are not affected by withDefaultValue.

Invoking transformer methods (e.g. map) will not preserve the default value.

Value Params
d

default value used for non-present keys

Returns

a wrapper of the map with a default value

Definition Classes
Inherited from
SortedMap
Source
SortedMap.scala
override def withFilter(p: (K, V) => Boolean): WithFilter[K, V, [A] =>> Iterable[A], [K, V] =>> Map[K, V], [K, V] =>> TreeMap[K, V]]
override def zip[B](that: IterableOnce[B]): Iterable[((K, V), B)]
def zipAll[A1 >: (K, V), B](that: Iterable[B], thisElem: A1, thatElem: B): Iterable[(A1, B)]

Returns a iterable collection formed from this iterable collection and another iterable collection by combining corresponding elements in pairs.

Returns a iterable collection formed from this iterable collection and another iterable collection by combining corresponding elements in pairs. If one of the two collections is shorter than the other, placeholder elements are used to extend the shorter collection to the length of the longer.

Value Params
that

the iterable providing the second half of each result pair

thatElem

the element to be used to fill up the result if that is shorter than this iterable collection.

thisElem

the element to be used to fill up the result if this iterable collection is shorter than that.

Returns

a new collection of type That containing pairs consisting of corresponding elements of this iterable collection and that. The length of the returned collection is the maximum of the lengths of this iterable collection and that. If this iterable collection is shorter than that, thisElem values are used to pad the result. If that is shorter than this iterable collection, thatElem values are used to pad the result.

Inherited from
IterableOps
Source
Iterable.scala

Deprecated and Inherited methods

@deprecated("Use ++ with an explicit collection argument instead of + with varargs", "2.13.0")
override def +[V1 >: V](elem1: (K, V1), elem2: (K, V1), elems: (K, V1)*): TreeMap[K, V1]
@deprecated("Consider requiring an immutable Map or fall back to Map.concat", "2.13.0")
override def +[V1 >: V](kv: (K, V1)): TreeMap[K, V1]
Deprecated
Definition Classes
Inherited from
SortedMapOps
Source
SortedMap.scala
@deprecated("Use ++ instead of ++: for collections of type Iterable", "2.13.0")
def ++:[V1 >: V](that: IterableOnce[(K, V1)]): Map[K, V1]
Deprecated
Inherited from
MapOps
Source
Map.scala
@deprecated("Use ++ instead of ++: for collections of type Iterable", "2.13.0")
def ++:[B >: (K, V)](that: IterableOnce[B]): Iterable[B]
Deprecated
Inherited from
IterableOps
Source
Iterable.scala
@deprecated("Use `++=` aka `addAll` instead of varargs `+=`; infix operations with an operand of multiple args will be deprecated", "2.13.0") @inline
final def +=(elem1: (K, V), elem2: (K, V), elems: (K, V)*): TreeMap[K, V]

Adds two or more elements to this growable collection.

Adds two or more elements to this growable collection.

Value Params
elem1

the first element to add.

elem2

the second element to add.

elems

the remaining elements to add.

Returns

the growable collection itself

Deprecated
Inherited from
Growable
Source
Growable.scala
@deprecated("Use -- or removeAll on an immutable Map", "2.13.0")
final def -(key1: K, key2: K, keys: K*): TreeMap[K, V]
Deprecated
Inherited from
MapOps
Source
Map.scala
@deprecated("Use - or remove on an immutable Map", "2.13.0")
final def -(key: K): TreeMap[K, V]
Deprecated
Inherited from
MapOps
Source
Map.scala
@deprecated("Consider requiring an immutable Map.", "2.13.0") @inline
def --(keys: IterableOnce[K]): TreeMap[K, V]
Deprecated
Inherited from
MapOps
Source
Map.scala
@deprecated("Use `--=` aka `subtractAll` instead of varargs `-=`; infix operations with an operand of multiple args will be deprecated", "2.13.3")
def -=(elem1: K, elem2: K, elems: K*): TreeMap[K, V]

Removes two or more elements from this shrinkable collection.

Removes two or more elements from this shrinkable collection.

Value Params
elem1

the first element to remove.

elem2

the second element to remove.

elems

the remaining elements to remove.

Returns

the shrinkable collection itself

Deprecated
Inherited from
Shrinkable
Source
Shrinkable.scala
@deprecated("Use foldLeft instead of /:", "2.13.0") @inline
final def /:[B](z: B)(op: (B, (K, V)) => B): B
Deprecated
Inherited from
IterableOnceOps
Source
IterableOnce.scala
@deprecated("Use foldRight instead of :\\", "2.13.0") @inline
final def :\[B](z: B)(op: ((K, V), B) => B): B
Deprecated
Inherited from
IterableOnceOps
Source
IterableOnce.scala
@deprecated("`aggregate` is not relevant for sequential collections. Use `foldLeft(z)(seqop)` instead.", "2.13.0")
def aggregate[B](z: => B)(seqop: (B, (K, V)) => B, combop: (B, B) => B): B
Deprecated
Inherited from
IterableOnceOps
Source
IterableOnce.scala
@deprecated("Use iterableFactory instead", "2.13.0") @deprecatedOverriding("Use iterableFactory instead", "2.13.0") @inline
Deprecated
Inherited from
IterableOps
Source
Iterable.scala
@deprecated("Use ordering.compare instead", "2.13.0") @deprecatedOverriding("Use ordering.compare instead", "2.13.0") @inline
def compare(k0: K, k1: K): Int

Comparison function that orders keys.

Comparison function that orders keys.

Deprecated
Inherited from
SortedOps
Source
SortedOps.scala
@deprecated("Use `dest ++= coll` instead", "2.13.0") @inline
final def copyToBuffer[B >: (K, V)](dest: Buffer[B]): Unit
Deprecated
Inherited from
IterableOnceOps
Source
IterableOnce.scala
@deprecated("Use .view.filterKeys(f). A future version will include a strict version of this method (for now, .view.filterKeys(p).toMap).", "2.13.0")
def filterKeys(p: K => Boolean): MapView[K, V]

Filters this map by retaining only keys satisfying a predicate.

Filters this map by retaining only keys satisfying a predicate.

Value Params
p

the predicate used to test keys

Returns

an immutable map consisting only of those key value pairs of this map where the key satisfies the predicate p. The resulting map wraps the original map without copying any elements.

Deprecated
Inherited from
MapOps
Source
Map.scala
@deprecated("Use rangeFrom", "2.13.0")
final def from(from: K): TreeMap[K, V]

Creates a ranged projection of this collection with no upper-bound.

Creates a ranged projection of this collection with no upper-bound.

Value Params
from

The lower-bound (inclusive) of the ranged projection.

Deprecated
Inherited from
SortedOps
Source
SortedOps.scala
@deprecated("Check .knownSize instead of .hasDefiniteSize for more actionable information (see scaladoc for details)", "2.13.0")

Tests whether this collection is known to have a finite size.

Tests whether this collection is known to have a finite size. All strict collections are known to have finite size. For a non-strict collection such as Stream, the predicate returns true if all elements have been computed. It returns false if the stream is not yet evaluated to the end. Non-empty Iterators usually return false even if they were created from a collection with a known finite size.

Note: many collection methods will not work on collections of infinite sizes. The typical failure mode is an infinite loop. These methods always attempt a traversal without checking first that hasDefiniteSize returns true. However, checking hasDefiniteSize can provide an assurance that size is well-defined and non-termination is not a concern.

Returns

true if this collection is known to have finite size, false otherwise.

See also

method knownSize for a more useful alternative

Deprecated

This method is deprecated in 2.13 because it does not provide any actionable information. As noted above, even the collection library itself does not use it. When there is no guarantee that a collection is finite, it is generally best to attempt a computation anyway and document that it will not terminate for infinite collections rather than backing out because this would prevent performing the computation on collections that are in fact finite even though hasDefiniteSize returns false.

Inherited from
IterableOnceOps
Source
IterableOnce.scala
@deprecated("Use .view.mapValues(f). A future version will include a strict version of this method (for now, .view.mapValues(f).toMap).", "2.13.0")
def mapValues[W](f: V => W): MapView[K, W]

Transforms this map by applying a function to every retrieved value.

Transforms this map by applying a function to every retrieved value.

Value Params
f

the function used to transform values of this map.

Returns

a map view which maps every key of this map to f(this(key)). The resulting map wraps the original map without copying any elements.

Deprecated
Inherited from
MapOps
Source
Map.scala
@deprecated("Use coll instead of repr in a collection implementation, use the collection value itself from the outside", "2.13.0")
final def repr: TreeMap[K, V]
Deprecated
Inherited from
IterableOps
Source
Iterable.scala
@deprecated("Use filterInPlace instead", "2.13.0") @inline
final def retain(p: (K, V) => Boolean): TreeMap[K, V]
Deprecated
Inherited from
MapOps
Source
Map.scala
@deprecated("Iterable.seq always returns the iterable itself", "2.13.0")
def seq: TreeMap[K, V]
Deprecated
Inherited from
Iterable
Source
Iterable.scala
@deprecated("Use rangeTo", "2.13.0")
final def to(to: K): TreeMap[K, V]

Create a range projection of this collection with no lower-bound.

Create a range projection of this collection with no lower-bound.

Value Params
to

The upper-bound (inclusive) of the ranged projection.

Deprecated
Inherited from
SortedOps
Source
SortedOps.scala
@deprecated("Use .iterator instead of .toIterator", "2.13.0") @inline
final def toIterator: Iterator[(K, V)]
Deprecated
Inherited from
IterableOnceOps
Source
IterableOnce.scala
@deprecated("Use .to(LazyList) instead of .toStream", "2.13.0") @inline
final def toStream: Stream[(K, V)]
Deprecated
Inherited from
IterableOnceOps
Source
IterableOnce.scala
@deprecated("Use toIterable instead", "2.13.0")
final def toTraversable: Iterable[(K, V)]

Converts this iterable collection to an unspecified Iterable.

Converts this iterable collection to an unspecified Iterable. Will return the same collection if this instance is already Iterable.

Returns

An Iterable containing all elements of this iterable collection.

Deprecated
Inherited from
IterableOps
Source
Iterable.scala
@deprecated("Use mapValuesInPlace instead", "2.13.0") @inline
final def transform(f: (K, V) => V): TreeMap[K, V]
Deprecated
Inherited from
MapOps
Source
Map.scala
@deprecated("Use rangeUntil", "2.13.0")
final def until(until: K): TreeMap[K, V]

Creates a ranged projection of this collection with no lower-bound.

Creates a ranged projection of this collection with no lower-bound.

Value Params
until

The upper-bound (exclusive) of the ranged projection.

Deprecated
Inherited from
SortedOps
Source
SortedOps.scala
@deprecated("Use m.clone().addOne((k,v)) instead of m.updated(k, v)", "2.13.0")
override def updated[V1 >: V](key: K, value: V1): TreeMap[K, V1]
Deprecated
Definition Classes
Inherited from
SortedMapOps
Source
SortedMap.scala
@deprecated("Use .view.slice(from, until) instead of .view(from, until)", "2.13.0")
def view(from: Int, until: Int): View[(K, V)]

A view over a slice of the elements of this collection.

A view over a slice of the elements of this collection.

Deprecated
Inherited from
IterableOps
Source
Iterable.scala

Implicits

Implicits

implicit val ordering: Ordering[K]