Array.pick<'T,'U> Function (F#)

Applies the given function to successive elements, returning the first result where function returns Some. If the function never returns Some then KeyNotFoundException is raised.

Namespace/Module Path: Microsoft.FSharp.Collections.Array

Assembly: FSharp.Core (in FSharp.Core.dll)

// Signature:
Array.pick : ('T -> 'U option) -> 'T [] -> 'U

// Usage:
Array.pick chooser array

Parameters

• chooser
  Type: 'T -> 'U option

  The function to generate options from the elements.

• array
  Type: 'T []

  The input array.

Exceptions

Return Value

The first result.

Remarks

This function is named Pick 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 example shows how to use Array.pick.

let values = [| ("a", 1); ("b", 2); ("c", 3) |]

let resultPick = Array.pick (fun elem ->
                    match elem with
                    | (value, 2) -> Some value
                    | _ -> None) values
printfn "%A" resultPick

Output

"b"

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

See Also

Reference

Collections.Array Module (F#)

Microsoft.FSharp.Collections Namespace (F#)