Array.sumBy<'T,^U> Function (F#)
Returns the sum of the results generated by applying the function to each element of the array.
Namespace/Module Path: Microsoft.FSharp.Collections.Array
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature:
Array.sumBy : ('T -> ^U) -> 'T [] -> ^U (requires ^U with static member (+) and ^U with static member Zero)
// Usage:
Array.sumBy projection array
Parameters
projection
Type: 'T -> ^UThe function to transform the array elements into the type to be summed.
array
Type: 'T []The input array.
Return Value
The resulting sum.
Remarks
This function is named SumBy 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 Array.sumBy.
[| 1 .. 10 |]
|> Array.sumBy (fun x -> x * x)
|> printfn "Sum: %d"
Output
385
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