Array.reduce<'T> Function (F#)
Applies a function to each element of the array, threading an accumulator argument through the computation. If the input function is f and the elements are i0...iN, then computes f (... (f i0 i1)...) iN. Raises ArgumentException if the array has size zero.
Namespace/Module Path: Microsoft.FSharp.Collections.Array
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature:
Array.reduce : ('T -> 'T -> 'T) -> 'T [] -> 'T
// Usage:
Array.reduce reduction array
Parameters
reduction
Type: 'T -> 'T -> 'TThe function to reduce a pair of elements to a single element.
array
Type: 'T[]The input array.
Exceptions
Exception |
Condition |
|---|---|
Thrown when the input array is empty. |
Return Value
The final result of the reductions.
Remarks
This function is named Reduce in compiled assemblies. If you are accessing the function from a language other than F#, or through reflection, use this name.
Example
The following example demonstrates the use of Array.reduce.
let names = [| "A"; "man"; "landed"; "on"; "the"; "moon" |]
let sentence = names |> Array.reduce (fun acc item -> acc + " " + item)
printfn "sentence = %s" sentence
sentence = A man landed on the moon
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