<'T,'U> Function (F#)
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Expand the table of content<'T,'U> Function (F#)

Creates a new collection whose elements are the results of applying the given function to each of the elements of the collection. The given function will be applied as elements are demanded using the MoveNext method on enumerators retrieved from the object.

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

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

// Signature: : ('T -> 'U) -> seq<'T> -> seq<'U>

// Usage: mapping source


Type: 'T -> 'U

A function to transform items from the input sequence.


Type: seq<'T>

The input sequence.




Thrown when the input sequence is null.

The result sequence.

The returned sequence may be passed between threads safely. However, individual IEnumerator values generated from the returned sequence should not be accessed concurrently.

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

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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