String.collect Function (F#)

Builds a new string whose characters are the results of applying a specified function to each of the characters of the input string and concatenating the resulting strings.

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

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

// Signature:
String.collect : (char -> string) -> string -> string

// Usage:
String.collect mapping str

Parameters

• mapping
  Type: char -> string

  The function to produce a string from each character of the input string.

• str
  Type: string

  The input string.

Exceptions

Return Value

The concatenated string.

Remarks

This function is named Collect 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 String.collect.

let spaceOut inputString =
     String.collect (fun c -> sprintf "%c " c) inputString
printfn "%s" (spaceOut "Hello World!")

Output

H e l l o   W o r l d ! 

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

Reference

Core.String Module (F#)

Microsoft.FSharp.Core Namespace (F#)