Unlike any other programming language, Kotlin also provides class cast support. The document.getElementById() method returns an Element type if instance. We basically want it to cast into HTMLDivElement to perform some <div> related operation. So, using as, we cast the Element into HTMLDivElement.
With the as keyword, it's unsafe casting. It's always better to use as?. On a successful cast, it will give an instance of that class; otherwise it returns null. So, while using as?, you have to use Kotlin's null safety feature. This gives your app a great safety net onLoginButtonClicked can be refactored by modifying the code a bit. The following code block is the modified version of the function. We have highlighted the modification ...
