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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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
Returns a new scala.collection.mutable.ArrayBuilder.
Returns a new scala.collection.mutable.ArrayBuilder.
- Source
- Array.scala
Creates a 4-dimensional array
Creates a 4-dimensional array
- Source
- Array.scala
Creates a 5-dimensional array
Creates a 5-dimensional array
- Source
- Array.scala
Returns an array containing a sequence of increasing integers in a range.
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.
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.
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
.
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
.
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
.
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
.
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')}
.
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