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

Article
02/04/2013

Sorts the elements of an array, using the given comparison function as the order, returning a new array.

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

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

// Signature:
Array.sortWith : ('T -> 'T -> int) -> 'T [] -> 'T []

// Usage:
Array.sortWith comparer array

Parameters

comparer
Type: 'T -> 'T -> int

The function to compare pairs of array elements.
array
Type: 'T []

The input array.

Return Value

The sorted array.

Remarks

This is not a stable sort, that is, the original order of equal elements might not be preserved. For a stable sort, consider using Seq.sort.

This function is named SortWith 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 shows the use of Array.sortWith.

open System

let array1 = [| "<>"; "&"; "&&"; "&&&"; "<"; ">"; "|"; "||"; "|||" |]
printfn "Before sorting: "
array1 |> printfn "%A"
let sortFunction (string1:string) (string2:string) =
    if (string1.Length > string2.Length) then
       1
    else if (string1.Length < string2.Length) then
       -1
    else
        String.Compare(string1, string2)

Array.sortWith sortFunction array1
|> printfn "After sorting: \n%A"

Output

Before sorting: 
[|"<>"; "&"; "&&"; "&&&"; "<"; ">"; "|"; "||"; "|||"|]
After sorting: 
[|"&"; "|"; "<"; ">"; "&&"; "||"; "<>"; "&&&"; "|||"|]

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

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