Seq.sumBy<'T,^U> Function (F#)
Returns the sum of the results generated by applying the function to each element of the sequence.
Namespace/Module Path: Microsoft.FSharp.Collections.Seq
Assembly: FSharp.Core (in FSharp.Core.dll)
Seq.sumBy : ('T -> ^U) -> seq<'T> -> ^U (requires ^U with static member (+) and ^U with static member Zero)
Seq.sumBy projection source
Type: 'T -> ^U
A function to transform items from the input sequence into the quantity that will be summed.
The input sequence.
The sum of the results of applying the projection function to each element of the sequence.
The generated elements are summed using the + operator and Zero property associated with the generated 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.
Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2
F# Core Library Versions
Supported in: 2.0, 4.0, Portable