Came across a few items I had not seen before. WeakMap and the Map and Set types in ES6 look useful. I think I had seen the map, reduce and filter methods on array but had not really considered their usefulness.
There were probably a bunch of other minor items that I picked up along the way. All in all, worth the small investment of time. I learned a few things and can feel more comfortable that there aren’t core concepts that I’ve missed by jumping into the middle up front.
One day soon I’ll likely read through the ES6 standard document. Ultimately that is the only way to hit all of the high points (missing details of products specific quirks, but then that is what the other books can do).
What I really need to do now is put together a small node based sandbox project with a web UI on the front end…