is it old version?

Question

is this old version of javascript which we are learning?

Answer 1

We are learning what is currently supported by most if not all web browsers. If an "old" specification is still valid then it's not old.
Current EcmaScript (JavaScript) version is: 7th edition - June 2016. It's so recent I don't think browser vendors are able to implement it so fast.

Answer 2

thanks