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

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]

key

Type: 'Key

The input key.

Exception

Condition

KeyNotFoundException

Thrown when the key is not found.

The value mapped to the key.

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

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

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