Array.iteri2<'T1,'T2> Function (F#)

Articolo
04/28/2015

Applies the given function to a pair of elements drawn from matching indices in two arrays, also passing the index of the elements. The two arrays must have the same lengths, otherwise ArgumentException is raised.

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

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

// Signature:
Array.iteri2 : (int -> 'T1 -> 'T2 -> unit) -> 'T1 [] -> 'T2 [] -> unit

// Usage:
Array.iteri2 action array1 array2

Parameters

action
Type: int -> 'T1 -> 'T2 -> unit

The function to apply to each index and pair of elements.
array1
Type: 'T1 []

The first input array.
array2
Type: 'T2 []

The second input array.

Exceptions

Exception	Condition
ArgumentException	Thrown when the input arrays differ in length.

Remarks

This function is named IterateIndexed2 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 examples shows the differences between Array.iter, Array.iter2, Array.iteri, and Array.iteri2.

let array1 = [| 1; 2; 3 |]
let array2 = [| 4; 5; 6 |]
Array.iter (fun x -> printfn "Array.iter: element is %d" x) array1
Array.iteri(fun i x -> printfn "Array.iteri: element %d is %d" i x) array1
Array.iter2 (fun x y -> printfn "Array.iter2: elements are %d %d" x y) array1 array2
Array.iteri2 (fun i x y ->
               printfn "Array.iteri2: element %d of array1 is %d element %d of array2 is %d"
                 i x i y)
            array1 array2

Output

Array.iter: element is 1
Array.iter: element is 2
Array.iter: element is 3
Array.iteri: element 0 is 1
Array.iteri: element 1 is 2
Array.iteri: element 2 is 3
Array.iter2: elements are 1 4
Array.iter2: elements are 2 5
Array.iter2: elements are 3 6
Array.iteri2: element 0 of array1 is 1 element 0 of array2 is 4
Array.iteri2: element 1 of array1 is 2 element 1 of array2 is 5
Array.iteri2: element 2 of array1 is 3 element 2 of array2 is 6

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

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