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Operators.( |> )<'T1,'U> Function (F#)

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

Apply a function to a value, the value being on the left, the function on the right.

Namespace/Module Path: Microsoft.FSharp.Core.Operators

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

Syntax

// Signature:
( |> ) : 'T1 -> ('T1 -> 'U) -> 'U

// Usage:
arg |> func

Parameters

arg Type: 'T1

The argument.

func Type: 'T1 -> 'U

The function.

Return Value

The function result.

Remarks

The following example demonstrates the use of the forward pipe operator.


let append1 string1 = string1 + ".append1"
let append2 string1 = string1 + ".append2"

let result1 = "abc" |> append1
printfn "\"abc\" |> append1 gives %A" result1

let result2 = "abc" 
              |> append1
              |> append2
printfn "result2: %A" result2

[1; 2; 3]
|> List.map (fun elem -> elem * 100)
|> List.rev
|> List.iter (fun elem -> printf "%d " elem)
printfn ""

Output:

"abc" |&gt; append1 gives "abc.append1"
result2: "abc.append1.append2"
300 200 100

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

Core.Operators Module (F#)

Microsoft.FSharp.Core Namespace (F#)

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