js curry

curry.js

const curry = fn => {
    if (fn.length <= 1) return fn;
    const generator = (...args) => {
        if (fn.length === args.length) {
            return fn(...args);
        } else {
            return (...args2) => generator(...args, ...args2);
        }
    };
    return generator;
};

const add = (a, b, c, d) => a + b + c + d;
const curriedAdd = curry(add);
const added = curriedAdd(5)(6)(7)(8);