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

  • Article

Creates a list by calling the given generator on each index.

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

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

// Signature:
List.init : int -> (int -> 'T) -> 'T list

// Usage:
List.init length initializer

Parameters

  • length
    Type: int

    The length of the list to generate.

  • initializer
    Type: int -> 'T

    The function to generate an element from an index.

Return Value

The list of generated elements.

Remarks

This function is named Initialize 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.init.

printfn "List of squares: %A" (List.init 10 (fun index -> index * index))

Output

List of squares: [0; 1; 4; 9; 16; 25; 36; 49; 64; 81]

Platforms

Windows 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2

Version Information

F# Runtime

Supported in: 2.0, 4.0

Silverlight

Supported in: 3

See Also

Reference

Collections.List Module (F#)

Microsoft.FSharp.Collections Namespace (F#)