String.iteri Function (F#)

Applies a specified function to each character and corresponding index in the string.

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

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

// Signature:
String.iteri : (int -> char -> unit) -> string -> unit

// Usage:
String.iteri action str

Parameters

• action
  Type: int -> char -> unit

  The function to apply to each character and index of the string.

• str
  Type: string

  The input string.

Exceptions

Remarks

This function is named IterateIndexed 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 example shows how to use String.iteri.

let enumerateCharacters inputString = 
    String.iteri (fun i c -> printfn "%d %c" i c) inputString
enumerateCharacters "TIME"
enumerateCharacters "SPACE"

Output

0 T
1 I
2 M
3 E
0 S
1 P
2 A
3 C
4 E

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

Core.String Module (F#)

Microsoft.FSharp.Core Namespace (F#)