What ECMAScript version is App Lab?

It looks like App Lab is ES5. Can I get that verified? I went through the versions looking for syntax errors on each version additions. I got ES5 the 2009 version.

This matters to me because I want to expand my curriculum to include advanced topics and knowing which version will help me know what syntax is expected. I can also direct my kids to the appropriate online resources that will show them the correct syntax.

Thank you.

Hi @jdonwells, App Lab is generally in ES5, but there are a few places that ES5 no longer supports our functionality (swap for example). It is not updated to ES6!