Putting the FUN in FUNctional programming.

functionalise.js

// Takes a function with two parameters and allows them to be used in the format fnc(x)(y)().
function functionalise(fnc) {
    return function functionalised(x) {
        return function (y) {
            if (y === undefined) {
                return x;
            } else {
                return functionalised(fnc(x, y));
            }
        };
    }
}

console.log(functionalise((x, y) => x * y)(2)(3)());
console.log(functionalise((x, y) => x + y)(2)(3)());