Keywords have special use in JavaScript and cannot be used as identifiers. Below the list of JavaScript keywords:
| break case catch class const continue debugger default delete do else |
export extends finally for function if import in instanceof new return |
super switch this throw try typeof var void while with yield |
Outside the keywords JavaScript defines reserved keywords which do not have special functionality now, but these may be used as future keywords. It should be noted that there are several different situations when these words are reserved.
a) Always reserved:
| enum |
b) Reserved in strict mode:
| implements interface let |
package private protected |
public static |
c) Reserved in module code:
| await |
d) Reserved words in older specifications:
| abstract boolean byte char double final |
float goto int long native short |
synchronized throws transient volatile |
Additionally literals that cannot be used as identifiers:
| null true false |
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