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Visual F#
Visual F# Development Portal
What's new in Visual F#
Visual F# Guided Tour
Using Visual Studio to Write F# Programs
F# Language Reference
F# Compiler (fsc.exe) Reference
F# Interactive (fsi.exe) Reference
F# Core Library Reference
Microsoft.FSharp.Collections Namespace
Array Module
Array2D Module
Array3D Module
Array4D Module
ComparisonIdentity Module
HashIdentity Module
List Module
List.append<'T> Function
List.average<^T> Function
List.averageBy<'T,^U> Function
List.choose<'T,'U> Function
List.chunkBySize<'T> Function
List.collect<'T,'U> Function
List.compareWith<'T> Function
List.concat<'T> Function
List.contains<'T> Function
List.countBy<'T,'Key> Function
List.distinct['t] Function
List.empty<'T> Type Function
List.exists<'T> Function
List.exists2<'T1,'T2> Function
List.filter<'T> Function
List.find<'T> Function
List.findIndex<'T> Function
List.fold<'T,'State> Function
List.fold2<'T1,'T2,'State> Function
List.foldBack<'T,'State> Function
List.foldBack2<'T1,'T2,'State> Function
List.forall<'T> Function
List.forall2<'T1,'T2> Function
List.head<'T> Function
List.init<'T> Function
List.isEmpty<'T> Function
List.iter<'T> Function
List.iter2<'T1,'T2> Function
List.iteri<'T> Function
List.iteri2<'T1,'T2> Function
List.length<'T> Function
List.map<'T,'U> Function
List.map2<'T1,'T2,'U> Function
List.map3<'T1,'T2,'T3,'U> Function
List.mapi<'T,'U> Function
List.mapi2<'T1,'T2,'U> Function
List.max<'T> Function
List.maxBy<'T,'U> Function
List.min<'T> Function
List.minBy<'T,'U> Function
List.nth<'T> Function
List.ofArray<'T> Function
List.ofSeq<'T> Function
List.partition<'T> Function
List.permute<'T> Function
List.pick<'T,'U> Function
List.reduce<'T> Function
List.reduceBack<'T> Function
List.replicate<'T> Function
List.rev<'T> Function
List.scan<'T,'State> Function
List.scanBack<'T,'State> Function
List.sort<'T> Function
List.sortBy<'T,'Key> Function
List.sortWith<'T> Function
List.splitAt<'T> Function
List.sum<^T> Function
List.sumBy<'T,^U> Function
List.tail<'T> Function
List.toArray<'T> Function
List.toSeq<'T> Function
List.tryFind<'T> Function
List.tryFindIndex<'T> Function
List.tryPick<'T,'U> Function
List.unzip<'T1,'T2> Function
List.unzip3<'T1,'T2,'T3> Function
List.zip<'T1,'T2> Function
List.zip3<'T1,'T2,'T3> Function
list<'T> Type Abbreviation
List<'T> Union
Map<'Key,'Value> Class
Collections.Map Module
Collections.ResizeArray<'T> Type Abbreviation
Collections.Seq Module
Collections.seq<'T> Type Abbreviation
Collections.Set<'T> Class
Collections.Set Module
Microsoft.FSharp.Control Namespace (F#)
Microsoft.FSharp.Core Namespace (F#)
Microsoft.FSharp.Core.CompilerServices Namespace (F#)
Microsoft.FSharp.Data Namespace
Microsoft.FSharp.Linq Namespace (F#)
Microsoft.FSharp.NativeInterop Namespace (F#)
Microsoft.FSharp.Quotations Namespace (F#)
Microsoft.FSharp.Reflection Namespace (F#)
System Namespace (F#)
System.Collections Namespace (F#)
System.Numerics Namespace (F#)
System.Threading Namespace (F#)
Visual F# Samples and Walkthroughs
Type Providers (F#)
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List.iter<'T> Function (F#)

Den Delimarsky|Last Updated: 8/18/2017
|
1 Contributor

Applies the given function to each element of the collection.

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

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

Syntax

// Signature:
List.iter : ('T -> unit) -> 'T list -> unit

// Usage:
List.iter action list

Parameters

action Type: 'T ->unit

The function to apply to elements from the input list.

list Type: 'Tlist

The input list.

Remarks

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

Example


let data = ["Cats";"Dogs";"Mice";"Elephants"]
data |> List.iter (fun x -> printfn "item: %s" x)

Output

item: Cats
item: Dogs
item: Mice
item: Elephants

Platforms

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

Version Information

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

See Also

Collections.List Module (F#)

Microsoft.FSharp.Collections Namespace (F#)

© 2017 Microsoft