bboy114crew

// This is the object that once its state changes, 
// it will notify all the observers.
function Observable() {
	this.observersList = [];
}
Observable.prototype.addObserver = function(observer) {
	this.observersList.push(observer);
}
Observable.prototype.removeObserver = function (observer) {
	var self = this;

bboy114crew

function Pubsub() {
  this.events = {};

}

Pubsub.prototype.publish = function(event, args) {
  if (!this.events[event]) {
    return false;
  }
  var subscribers = this.events[event];

bboy114crew

This script attaches a stopwatch into the toolbar of Leetcode's problem page.

The feature is simple:

• Start/Stop the stopwatch
• Auto start after 2 mins remaining on the problem
• Restore unstopped stopwatch for the next visit on the problem

Use this script with any browser extension allowing attaching JS to the page. (I use User JavaScript and CSS)