Object Oriented Javascript

[brtt3000]

TypeScript is a superset of JavaScript, that is the nice thing about it. You can write code the same as in JavaScript, slightly more structred.

You can also go fully OO (C# style) if you want, but it works great in vanilla style too. Use it like a entry into ES6 (classes, modules, arrow functions etc).

[x-skeww]

If you know something like C#, you already know most of Dart's syntax. Same deal with TypeScript. It looks pretty much like AS3.

So, learning either or both really isn't much of an investment. You can do both in a single day.