The code in it will still run and work but there are much better patterns and features now that help you write more succinct and less error-prone code.
ES6 and ES7 are widely supported now and are much better languages IMO.
Thanks, that's kind of what I thought. I recently, finally, took it off of my book shelf and stuffed it into a box in the garage, but it's been in the back of my mind a few times as I've been going through other resources. It's good for the historical understanding but I couldn't see it being terribly relevant today.
ES6 and ES7 are widely supported now and are much better languages IMO.