Array.filter<'T> Function (F#)
Returns a new collection containing only the elements of the collection for which the given predicate returns true.
Namespace/Module Path: Microsoft.FSharp.Collections.Array
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature:
Array.filter : ('T -> bool) -> 'T [] -> 'T []
// Usage:
Array.filter predicate array
Parameters
predicate
Type: 'T ->boolThe function to test the input elements.
array
Type: 'T[]The input array.
Return Value
An array containing the elements for which the given predicate returns true.
Remarks
This function is named Filter in compiled assemblies. If accessing the function from a language other than F#, or through reflection, use this name.
Example
The following example shows how to use Array.filter to select elements from an array.
let names = [|"Bob"; "Ann"; "Stephen"; "Vivek"; "Fred"; "Kim"; "Brian"; "Ling"; "Jane"; "Jonathan"|]
let longNames = names |> Array.filter (fun x -> x.Length > 4)
printfn "names = %A\n" names
printfn "longNames = %A" longNames
names = [|"Bob"; "Ann"; "Stephen"; "Vivek"; "Fred"; "Kim"; "Brian"; "Ling"; "Jane"; "Jonathan"|] longNames = [|"Stephen"; "Vivek"; "Brian"; "Jonathan"|]
Platforms
Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2
Version Information
F# Core Library Versions
Supported in: 2.0, 4.0, Portable