Title here
Summary here
Variadic Functions in F#
Here’s a function that will take an arbitrary number of ints as arguments.
open System
let sum (nums: int seq) =
printf "%A " nums
let total = Seq.sum nums
printfn "%d" total
let main () =
// Variadic functions can be called in the usual way with individual arguments.
sum [1; 2]
sum [1; 2; 3]
// If you already have multiple args in a list, apply them to a variadic function using
// Seq.toList to convert them to a list like this.
let nums = [1; 2; 3; 4]
sum nums
// Entry point of the program
main ()To run this F# code, place it in a file named variadic-functions.fsx and use dotnet fsi to execute it.
$ dotnet fsi variadic-functions.fsxOutput:
[1; 2] 3
[1; 2; 3] 6
[1; 2; 3; 4] 10Another key aspect of functions is their ability to form closures, which we’ll look at next.