Map.Item<'Key,'Value> Property (F#)

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Lookup an element in the map. Raise KeyNotFoundException if no binding exists in the map.

Namespace/Module Path: Microsoft.FSharp.Collections

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

// Signature:
member this.Item ('Key) : 'Value (requires comparison)

// Usage:
map.[key]

Parameters

  • key
    Type: 'Key

    The input key.

Exceptions

Exception

Condition

KeyNotFoundException

Thrown when the key is not found.

Return Value

The value mapped to the key.

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

See Also

Reference

Collections.Map<'Key,'Value> Class (F#)

Microsoft.FSharp.Collections Namespace (F#)