Cancellable Timeout

Implement setCancellableTimeout

Implement a function setCancellableTimeout, that acts like setTimeout but instead of returning a timer ID, it returns a function that when called, cancels the pending callback function. The setCancellableTimeout function should have the exact same signature as setTimeout:

setCancellableTimeout(callback);
setCancellableTimeout(callback, delay);
setCancellableTimeout(callback, delay, param1);
setCancellableTimeout(callback, delay, param1, param2);
setCancellableTimeout(callback, delay, param1, param2, /* … ,*/ paramN);

You are recommended to read up on setTimeout on MDN Docs if you are unfamiliar.

Examples

let i = 0;

// t = 0:
const cancel = setCancellableTimeout(() => {
  i++;
}, 100);

// t = 50:
cancel();

// t = 100: i is still 0 because cancel() was called.

let i = 0;

// t = 0:
const cancel = setCancellableTimeout(() => {
  i++;
}, 100);

// t = 50:
cancel();

// t = 100: i is still 0 because cancel() was called.

let i = 0;

// t = 0:
const cancel = setCancellableTimeout(() => {
  i++;
}, 100);

// t = 50:
cancel();

// t = 100: i is still 0 because cancel() was called.

My Solution

Editorial