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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

chooser

Type: 'T -> 'U option

The function to generate options from the elements.

array

Type: 'T []

The input array.

Exception

Condition

KeyNotFoundException

Thrown if every result from chooser is None.

The first result.

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.

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"

Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

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