list.contains['t]-function-[fsharp].md

title	List.contains<'T> Function (F#)
description	List.contains<'T> Function (F#)
keywords	visual f#, f#, functional programming
author	liboz
manager	danielfe
ms.date	07/6/2016
ms.topic	language-reference
ms.prod	visual-studio-dev14
ms.technology	devlang-fsharp
ms.assetid	52f70370-0c04-4823-bc6e-e92b60369420

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

Evaluates to true if the given element is in the input list.

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

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

Syntax

// Signature:
List.contains : 'T -> 'T list -> bool

// Usage:
List.contains element source

Parameters

element Type: 'T

The element to find.

source Type: 'T list

The input list.

Exceptions

Exception	Condition
ArgumentNullException	Thrown when the input list is null.

Return Value

Evaluates to true if the given element is in the input list. Otherwise, it will return false.

Remarks

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

Example

The following code shows how to use List.contains.

[!code-fsharpMain]

Output

true
false

Platforms

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

Version Information

F# Core Library Versions

Supported in: 4.0, Portable

See Also

Collections.List Module (F#)

Microsoft.FSharp.Collections Namespace (F#)