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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


Type: 'T -> 'U option

The function to generate options from the elements.


Type: 'T []

The input array.




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



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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