#2725 - Interval Cancellation

Easy • View on LeetCode • View on GitHub

Problem Description

Given a function fn, an array of arguments args, and an interval time t, return a cancel function cancelFn.

After a delay of cancelTimeMs, the returned cancel function cancelFn will be invoked.

> setTimeout(cancelFn, cancelTimeMs) The function fn should be called with args immediately and then called again every t milliseconds until cancelFn is called at cancelTimeMs ms.

Solution

/**
 * @param {Function} fn
 * @param {Array} args
 * @param {number} t
 * @return {Function}
 */
var cancellable = function(fn, args, t) {
  fn(...args);
  const timer = setInterval(() => fn(...args), t);
  return () => clearInterval(timer);
};