Array.partition<'T> Function (F#)

Article
07/11/2012

Splits the collection into two collections, containing the elements for which the given predicate returns true and false respectively.

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

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

// Signature:
Array.partition : ('T -> bool) -> 'T [] -> 'T [] * 'T []

// Usage:
Array.partition predicate array

Parameters

predicate
Type: 'T -> bool

The function to test the input elements.
array
Type: 'T []

The input array.

Return Value

A pair of arrays. The first containing the elements the predicate for which the predicate evaluated to true, and the second containing those for which the predicate evaluated to false.

Remarks

This function is named Partition 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 illustrates the use of Array.partition.

let removeOutliers array1 min max =
    Array.partition (fun elem -> elem > min && elem < max) array1
    |> fst
removeOutliers [| 1 .. 100 |] 50 60
|> printf "%A"

Output

[|51; 52; 53; 54; 55; 56; 57; 58; 59|]

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

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