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

Returns the length of the list.

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

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

// Signature:
List.length : 'T list -> int

// Usage:
List.length list

list

Type: 'T list

The input list.

The length of the list.

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

The following code shows how to use List.length.

List.length [ 1 .. 100 ] |> printfn "Length: %d"
List.length [ ] |> printfn "Length: %d"
List.length [ 1 .. 2 .. 100 ] |> printfn "Length: %d"

Output

Length: 100
Length: 0
Length: 50

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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