Reserved keywords in ECMAScript 5
The following list shows the keywords that are reserved in ECMAScript 5 and also includes keywords that are reserved for future as well as keywords that are disallowed in strict mode:-
Reserved keywords in ECMAScript 6
The following list shows the keywords that are reserved in ECMAScript 6 and also includes keywords that are reserved for future as well as keywords that are disallowed in strict mode.
Future Reserved keywords in Older Standards
The following list shows the keywords that were reserved as future keywords by the older specifications (before ECMAScript 5 or ES5).