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Map.exists<'Key,'T> Function (F#)

Den Delimarsky|Last Updated: 8/18/2017
1 Contributor

Returns true if the given predicate returns true for one of the bindings in the map.

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

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


// Signature:
Map.exists : ('Key -> 'T -> bool) -> Map<'Key,'T> -> bool (requires comparison)

// Usage:
Map.exists predicate table


predicate Type: 'Key -> 'T ->bool

The function to test the input elements.

table Type: Map<'Key,'T>

The input map.

Return Value

true if the predicate returns true for one of the key/value pairs.


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


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

Version Information

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

See Also

Collections.Map Module (F#)

Microsoft.FSharp.Collections Namespace (F#)

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