2637-promise-time-limit.ts

// Title: Promise Time Limit
// Description:
//     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".
// Link: https://leetcode.com/problems/promise-time-limit/

type Fn = (...params: any[]) => Promise<any>;

function timeLimit(fn: Fn, t: number): Fn {
  return function (...args) {
    const timer = new Promise((resolve, reject) => {
      setTimeout(() => {
        reject("Time Limit Exceeded");
      }, t);
    });

    return Promise.race([fn.apply(this, args), timer]);
  };
}

/**
 * const limited = timeLimit((t) => new Promise(res => setTimeout(res, t)), 100);
 * limited(150).catch(console.log) // "Time Limit Exceeded" at t=100ms
 */