Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All
Expand Minimize

Array.exists2<'T1,'T2> Function (F#)

Tests if any pair of corresponding elements of the arrays satisfies the given predicate.

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

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

// Signature:
Array.exists2 : ('T1 -> 'T2 -> bool) -> 'T1 [] -> 'T2 [] -> bool

// Usage:
Array.exists2 predicate array1 array2


Type: 'T1 -> 'T2 -> bool

The function to test the input elements.


Type: 'T1 []

The first input array.


Type: 'T2 []

The second input array.

true if any result from predicate is true. Otherwise, false.

The predicate is applied to matching elements in the two collections up to the lesser of the two lengths of the collections. If any application returns true then the overall result is true and no further elements are tested. Otherwise, if one collection is longer than the other then the ArgumentException exception is raised. Otherwise, false is returned.

This function is named Exists2 in compiled assemblies. If you are accessing the member from a language other than F#, or through reflection, use this name.

The following example shows the use Array.exists2 to test whether two arrays have at least one equal element.

let haveEqualElement = Array.exists2 (fun elem1 elem2 -> elem1 = elem2)
printfn "%A" (haveEqualElement [| 1; 2; 3 |] [| 3; 2; 1|])

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

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

© 2015 Microsoft