This is what I’ve found out so far.
There were seems to be no new keywords in Java since 5.0 (which added enum).
Java vs. ECMAScript 5.1:
debuggerdeletefunctionintypeofvarwithexportletyield
Java vs. ECMAScript 6 Rev 36 Release Candidate 3:
- all of above
await
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solved Which keywords are reserved in JavaScript but not in Java?