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I think ES and ECMAScript are pretty interchangeable, as are 6 and 2015 (the latter is official, but the former is what it was called for forever). I've seen all 4 of those names used.

ES2015 is pretty common in my experience. I don't recall seeing ECMAScript very often. ES6 or ES2015 seem to be the most common.

I don’t think it’s a joke, but I haven’t seen ECMAScript much in practice, just es6 and es2015 in npm.

Full “ECMAScript” seems more common for clarity in proposals.

So helpful