Scala 3/API/scala.collection/WithFilter

WithFilter

@SerialVersionUID(3L) abstract class WithFilter[+A, +CC[_]] extends Serializable

A template trait that contains just the map, flatMap, foreach and withFilter methods of trait Iterable.

A template trait that contains just the map, flatMap, foreach and withFilter methods of trait Iterable.

Type Params
A

Element type (e.g. Int)

CC

Collection type constructor (e.g. List)

class Object
trait Matchable
class Any
class WithFilter[A, CC]

Value members

Abstract methods

def flatMap[B](f: A => IterableOnce[B]): CC[B]

Builds a new collection by applying a function to all elements of the filtered outer collection containing this WithFilter instance that satisfy

Builds a new collection by applying a function to all elements of the filtered outer collection containing this WithFilter instance that satisfy

Type Params
B

the element type of the returned collection.

Value Params
f

the function to apply to each element.

Returns

a new collection resulting from applying the given collection-valued function f to each element of the filtered outer collection and concatenating the results.

def foreach[U](f: A => U): Unit

Applies a function f to all elements of the filtered outer collection.

Applies a function f to all elements of the filtered outer collection.

Type Params
U

the type parameter describing the result of function f. This result will always be ignored. Typically U is Unit, but this is not necessary.

Value Params
f

the function that is applied for its side-effect to every element. The result of function f is discarded.

def map[B](f: A => B): CC[B]

Builds a new collection by applying a function to all elements of the filtered outer collection.

Builds a new collection by applying a function to all elements of the filtered outer collection.

Type Params
B

the element type of the returned collection.

Value Params
f

the function to apply to each element.

Returns

a new collection resulting from applying the given function f to each element of the filtered outer collection and collecting the results.

def withFilter(q: A => Boolean): WithFilter[A, CC]

Further refines the filter for this filtered collection.

Further refines the filter for this filtered collection.

Value Params
q

the predicate used to test elements.

Returns

an object of class WithFilter, which supports map, flatMap, foreach, and withFilter operations. All these operations apply to those elements of this collection which also satisfy both p and q predicates.