Currying with generators

curry.js

function* curryGen(fn) {
  const l = fn.length;
  const args = [];

  while (true) {
    if (args.length < l) {
      args.push(...yield);
    } else {
      return fn(...args);
    }
  }
}

function curry(fn) {
  const iter = curryGen(fn);

  iter.next();

  return function curryOnce(...args) {
    const { done, value } = iter.next(args);

    return done ? value : curryOnce;
  };
}

console.log(curry((a, b, c) => a + b + c)()(1)()(2,3)); // 6