Given a function fn, an array of arguments args, and an interval time t, return a cancel function cancelFn. The function fn should be called with args immediately and then called again every t millise

Sure, I can help you with that! Here's an example implementation in JavaScript:

function repeat(fn, args, t) {
  const intervalId = setInterval(() => {
    fn.apply(null, args);
  }, t);
  
  function cancelFn() {
    clearInterval(intervalId);
  }
  
  fn.apply(null, args);
  return cancelFn;
}

This function takes in three parameters: `fn` is the function to be called repeatedly, `args` is an array of arguments to be passed to `fn`, and `t` is the time interval in milliseconds.

The function sets up an interval using `setInterval` to repeatedly call `fn` with `args` every `t` milliseconds. It also immediately calls `fn` with `args` once before starting the interval.

The function returns a `cancelFn` function that can be used to cancel the interval and stop further calls to `fn`.

You can use this function like this:

const cancel = repeat(console.log, ['Hello!'], 1000);

// This will log 'Hello!' every second
// To cancel the interval, call the cancel function
cancel();