Fsharp: Function

define function

• write a tutorial on how to define function in fsharp, and covering fixed number of param, rest param, or optional param, named param, default values.
• https://x.com/i/grok/share/1ecRWd3K1vs9Q6AIir7G4M2i7

let fadd x y = x + y
printfn "%d" (fadd 3 4)
// 7