throttle.js

function throttle(task, ms, context) {
  let started = false;
  let lastCall = -Infinity;
  let taskScheduled = false;
  let lastArguments = [];

  return function() {
    if (!started) {
      started = true;
      lastCall = Date.now();
      task.apply(context || null, arguments);
    } else {
      const remainingTime = Date.now() - lastCall;

      if (remainingTime >= ms) {
        lastCall = Date.now();
        task.apply(context || null, arguments);
      } else {
        if (!taskScheduled) {
          setTimeout(() => {
            taskScheduled = false;
            task.apply(context || null, lastArguments);
          }, remainingTime);
          taskScheduled = true;
        }
        lastArguments = arguments;
      }
    }
  };
}