var a = "42";
var b = 42;
a == b; // true
a === b; // false
Object Destructing, Generators, this object; async , parallel, and concurrent functions
and the List goes on, these are only the basics. If you wanna up your JS game then Go BACK TO THE FOUNDATION , give YDKJS (its a free ebook repo) a read and there are many more resources to know about and also go deep into ES6 and the latest features JS is always updated to make your life better no harm in knowing how.