This are how you make objects, this are how you make functions, here's constants, here's variables. Use let instead of var for the scoping you're familiar with. Here's a standard library, it's a bit spartan but pretty much everything is familiar.

Later on I stopped using 'class' and 'this' and just used closures that return objects (I consider it more idiomatic, YMMV). I got a good feeling for when to use an object and when to use a Map.