Array.choose<'T,'U> Function (F#)
Applies the given function to each element of the array. Returns the array comprised of the results x for each element where the function returns Some(x).
Namespace/Module Path: Microsoft.FSharp.Collections.Array
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature:
Array.choose : ('T -> 'U option) -> 'T [] -> 'U []
// Usage:
Array.choose chooser array
Parameters
chooser
Type: 'T -> 'U optionThe function to generate options from the elements.
array
Type: 'T []The input array.
Return Value
The array of results.
Remarks
This function is named Choose in compiled assemblies. If you are accessing the function from a language other than F#, or through reflection, use this name.
Example
The following code demonstrates the use of Array.choose to perform an operation only on the even numbers in an array.
printfn "%A" (Array.choose (fun elem -> if elem % 2 = 0 then
Some(float (elem*elem - 1))
else
None) [| 1 .. 10 |])
[|3.0; 15.0; 35.0; 63.0; 99.0|]
Platforms
Windows 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2
Version Information
F# Runtime
Supported in: 2.0, 4.0
Silverlight
Supported in: 3