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
projection Type: 'T -> ^U
The function to transform the array elements into the type to be summed.
array Type: 'T
The input array.
The sum of the results of applying the projection function to each element of the array.
May throw an OverflowException due to arithmetic overflows.
The results are summed using the checked + operator and Zero property associated with the summed type.
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.
[| 1 .. 10 |] |> Array.sumBy (fun x -> x * x) |> printfn "Sum: %d"
Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2
F# Core Library Versions
Supported in: 2.0, 4.0, Portable