Single arg pattern matching with the fun operator
Reasonml has pattern matching in specific syntaxes and one of those syntaxes is the
fun operator which helps you define multiple patterns for single argument functions.
let something = fun | "hello" => "world" | "busta" => "rhymes" | x => "something else"
something("hello") /* results in "world" */
This doesn't work for multiple arguments however, so when you see something like this:
let add = fun | (1, 1) => 3 | (x, y) => x + y;
just remember that the single argument in this case is a tuple, called like this