solutions/2637-promise-time-limit.js

/**
 * 2637. Promise Time Limit
 * https://leetcode.com/problems/promise-time-limit/
 * Difficulty: Medium
 *
 * Given an asynchronous function fn and a time t in milliseconds, return a new time limited
 * version of the input function. fn takes arguments provided to the time limited function.
 *
 * The time limited function should follow these rules:
 * - If the fn completes within the time limit of t milliseconds, the time limited function
 *   should resolve with the result.
 * - If the execution of the fn exceeds the time limit, the time limited function should
 *   reject with the string "Time Limit Exceeded".
 */

/**
 * @param {Function} fn
 * @param {number} t
 * @return {Function}
 */
var timeLimit = function(fn, t) {
  return async function(...args) {
    return Promise.race([
      fn(...args),
      new Promise((_, reject) => setTimeout(() => reject('Time Limit Exceeded'), t)),
    ]);
  };
};