Topic: Javascript setTimeout
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    If we are using modern Javascript, we can use anonymous or arrow functions to make our calls simpler for short functions. This will reduce the amount of code we have to write – eg creating a separate function definition and coming up with specific names, etc. When creating front end interactions with JavaScript, the setTimeout function can come in handy for delaying execution. For example we might want to wait for an animation to finish then execute a loading feature. App.service.tsWhenever the user logs in, we are calling appService setUserLoggedIn method to set the flag true. Let’s see how we can implement the idle timeout feature in the Angular application with the ng-idle library. As a first step, we need to install ng-idle dependencies in the existing application. Actually we are using the library called ng-idle But, I want to show how we can detect the user is idle without any libraries. We have Keyboard events and mouse events from the DOM API which we can use to detect the users are idle or not. Basically, when there is no mouse or keyboard events fired, we can conclude that the user is idle. Angular’s $timeout is tightly integrated into the whole testing suite and ngMock. This means that whenever you’re testing code with $timeouts you know it won’t be executed until you specifically call $timeout.flush(). The problem is that to be aware of when changes happen, i.e. when to run the digest cycle, Angular needs to know when asynchronous things happen. That includes user interaction, AJAX requests and, yes, timeouts. Here setTimeout is executed only once after 3 seconds or 3000 milliseconds. To halt or clear the setTimeout event, we can use clearTimeout() method. Here we do not use this keyword/variable inside setInterval method, as it would reference to setInterval method and not the HomePage class component.

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