2632-curry.js

/**
 * 2632. Curry
 * https://leetcode.com/problems/curry/
 * Difficulty: Medium
 *
 * Given a function fn, return a curried version of that function.
 *
 * A curried function is a function that accepts fewer or an equal number of parameters as the
 * original function and returns either another curried function or the same value the original
 * function would have returned.
 *
 * In practical terms, if you called the original function like sum(1,2,3), you would call the
 * curried version like csum(1)(2)(3), csum(1)(2,3), csum(1,2)(3), or csum(1,2,3). All these
 * methods of calling the curried function should return the same value as the original.
 */

/**
 * @param {Function} fn
 * @return {Function}
 */
var curry = function(fn) {
  return function curried(...args) {
    if (args.length >= fn.length) {
      return fn(...args);
    }
    return (...nextArgs) => curried(...args, ...nextArgs);
  };
};