Title here
Summary here
Functions in F#
Functions are central in F#. We’ll learn about functions with a few different examples.
open System
// Here's a function that takes two integers and returns
// their sum as an integer.
let plus a b =
a + b
// F# doesn't require explicit returns. The last expression
// in a function is automatically returned.
// When you have multiple parameters, you can separate them
// with spaces. The type is inferred, but can be explicitly specified.
let plusPlus (a: int) (b: int) (c: int) =
a + b + c
[<EntryPoint>]
let main argv =
// Call a function just as you'd expect, with name args.
let res = plus 1 2
printfn "1+2 = %d" res
let res = plusPlus 1 2 3
printfn "1+2+3 = %d" res
0 // return an integer exit codeTo run the program, save it as functions.fs and use the F# compiler:
$ dotnet fsi functions.fs
1+2 = 3
1+2+3 = 6There are several other features to F# functions. One is pattern matching, which we’ll look at next.