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

Returns the length of an array.

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

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

// Signature:
Array.length : 'T [] -> int

// Usage:
Array.length array

array

Type: 'T []

The input array.

The length of the array.

You can also use property Length.

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 example demonstrates how to use Array.length.

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