Utility methods for operating on arrays. For example:
val a = Array(1, 2)
val b = Array.ofDim[Int](2)
val c = Array.concat(a, b)
where the array objects a
, b
and c
have respectively the values
Array(1, 2)
, Array(0, 0)
and Array(1, 2, 0, 0)
.
- Companion
- class
- Source
- Array.scala
Type members
Classlikes
Value members
Concrete methods
Creates an array with given elements.
- Value Params
- xs
the elements to put in the array
- Returns
an array containing all elements from xs.
- Source
- Array.scala
Concatenates all arrays into a single array.
- Value Params
- xss
the given arrays
- Returns
the array created from concatenating
xss
- Source
- Array.scala
Copy one array to another.
Equivalent to Java's
System.arraycopy(src, srcPos, dest, destPos, length)
,
except that this also works for polymorphic and boxed arrays.
Note that the passed-in dest
array will be modified by this call.
- Value Params
- dest
destination array.
- destPos
starting position in the destination array.
- length
the number of array elements to be copied.
- src
the source array.
- srcPos
starting position in the source array.
- See also
java.lang.System#arraycopy
- Source
- Array.scala
Copy one array to another, truncating or padding with default values (if necessary) so the copy has the specified length. The new array can have a different type than the original one as long as the values are assignment-compatible. When copying between primitive and object arrays, boxing and unboxing are supported.
Equivalent to Java's
java.util.Arrays.copyOf(original, newLength, newType)
,
except that this works for all combinations of primitive and object arrays
in a single method.
- See also
java.util.Arrays#copyOf
- Source
- Array.scala
Copy one array to another, truncating or padding with default values (if necessary) so the copy has the specified length.
Equivalent to Java's
java.util.Arrays.copyOf(original, newLength)
,
except that this works for primitive and object arrays in a single method.
- See also
java.util.Arrays#copyOf
- Source
- Array.scala
Compare two arrays per element.
A more efficient version of xs.sameElements(ys)
.
Note that arrays are invariant in Scala, but it may
be sound to cast an array of arbitrary reference type
to Array[AnyRef]
. Arrays on the JVM are covariant
in their element type.
Array.equals(xs.asInstanceOf[Array[AnyRef]], ys.asInstanceOf[Array[AnyRef]])
- Value Params
- xs
an array of AnyRef
- ys
an array of AnyRef
- Returns
true if corresponding elements are equal
- Source
- Array.scala
Returns an array that contains the results of some element computation a number of times.
Note that this means that elem
is computed a total of n times:
scala> Array.fill(3){ math.random }
res3: Array[Double] = Array(0.365461167592537, 1.550395944913685E-4, 0.7907242137333306)
- Value Params
- elem
the element computation
- n
the number of elements desired
- Returns
an Array of size n, where each element contains the result of computing
elem
.- Source
- Array.scala
Returns a two-dimensional array that contains the results of some element computation a number of times.
- Value Params
- elem
the element computation
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- Source
- Array.scala
Returns a three-dimensional array that contains the results of some element computation a number of times.
- Value Params
- elem
the element computation
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- Source
- Array.scala
Returns a four-dimensional array that contains the results of some element computation a number of times.
- Value Params
- elem
the element computation
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- n4
the number of elements in the 4th dimension
- Source
- Array.scala
Returns a five-dimensional array that contains the results of some element computation a number of times.
- Value Params
- elem
the element computation
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- n4
the number of elements in the 4th dimension
- n5
the number of elements in the 5th dimension
- Source
- Array.scala
Build an array from the iterable collection.
scala> val a = Array.from(Seq(1, 5))
val a: Array[Int] = Array(1, 5)
scala> val b = Array.from(Range(1, 5))
val b: Array[Int] = Array(1, 2, 3, 4)
- Value Params
- it
the iterable collection
- Returns
an array consisting of elements of the iterable collection
- Source
- Array.scala
Returns an array containing repeated applications of a function to a start value.
- Value Params
- f
the function that is repeatedly applied
- len
the number of elements returned by the array
- start
the start value of the array
- Returns
the array returning
len
values in the sequencestart, f(start), f(f(start)), ...
- Source
- Array.scala
Creates a 4-dimensional array
- Source
- Array.scala
Creates a 5-dimensional array
- Source
- Array.scala
Returns an array containing a sequence of increasing integers in a range.
- Value Params
- end
the end value of the array, exclusive (in other words, this is the first value not returned)
- start
the start value of the array
- Returns
the array with values in range
start, start + 1, ..., end - 1
up to, but excluding,end
.- Source
- Array.scala
Returns an array containing equally spaced values in some integer interval.
- Value Params
- end
the end value of the array, exclusive (in other words, this is the first value not returned)
- start
the start value of the array
- step
the increment value of the array (may not be zero)
- Returns
the array with values in
start, start + step, ...
up to, but excludingend
- Source
- Array.scala
Returns an array containing values of a given function over a range of integer values starting from 0.
- Value Params
- f
The function computing element values
- n
The number of elements in the array
- Returns
A traversable consisting of elements
f(0),f(1), ..., f(n - 1)
- Source
- Array.scala
Returns a two-dimensional array containing values of a given function
over ranges of integer values starting from 0
.
- Value Params
- f
The function computing element values
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- Source
- Array.scala
Returns a three-dimensional array containing values of a given function
over ranges of integer values starting from 0
.
- Value Params
- f
The function computing element values
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- Source
- Array.scala
Returns a four-dimensional array containing values of a given function
over ranges of integer values starting from 0
.
- Value Params
- f
The function computing element values
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- n4
the number of elements in the 4th dimension
- Source
- Array.scala
Returns a five-dimensional array containing values of a given function
over ranges of integer values starting from 0
.
- Value Params
- f
The function computing element values
- n1
the number of elements in the 1st dimension
- n2
the number of elements in the 2nd dimension
- n3
the number of elements in the 3rd dimension
- n4
the number of elements in the 4th dimension
- n5
the number of elements in the 5th dimension
- Source
- Array.scala
Called in a pattern match like { case Array(x,y,z) => println('3 elements')}
.
- Value Params
- x
the selector value
- Returns
sequence wrapped in a scala.Some, if
x
is an Array, otherwiseNone
- Source
- Array.scala