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List.head<'T> Function (F#)

Den Delimarsky|Last Updated: 7/5/2016
|
1 Contributor

Returns the first element of the list.

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

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

Syntax

// Signature:
List.head : 'T list -> 'T

// Usage:
List.head list

Parameters

list Type: 'Tlist

The input list.

Exceptions

ExceptionCondition
ArgumentExceptionThrown when the list is empty.

Return Value

The first element of the list.

Remarks

Raises System.ArgumentException if list is empty

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

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

Collections.List Module (F#)

Microsoft.FSharp.Collections Namespace (F#)

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