fp-curry

fp-curry

/**
 * @param curry
 *
 * @usage
 * const _sum3 = (x, y, z) => x + y + z;
 * const _sum4 = (p, q, r, s) => p + q + r + s;
 *
 * const sum3 = curry(_sum3);
 * sum3(1)(3)(2); // 6
 * const sum4 = curry(_sum4);
 * sum4(1)(3)(2)(4); // 10
 *
 */
export const curry = fn => {
  if (fn.length === 0) {
    return fn;
  }
  const innerFn = (N, args) => (...x) => {
    if (N <= x.length) {
      return fn(...args, ...x);
    }
    return innerFn(N - x.length, [...args, ...x]);
  };

  return innerFn(fn.length, []);
};