2725-interval-cancellation.js

/**
 * 2725. Interval Cancellation
 * https://leetcode.com/problems/interval-cancellation/
 * Difficulty: Easy
 *
 * 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.
 */

/**
 * @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);
};