Reserved words

There are a good number of words reserved in JavaScript that cannot be used for variable names. Here is a list of most of them:

abstract arguments await boolean break byte case catch char class const continue debugger default delete do

double else enum eval export extends false final finally float for function goto if implements import

in instanceof int interface let long native new null package private protected public return short static

super switch synchronized this throw throws transient true try typeof var void volatile while with yield

 

These are always in lowercase, and if you were to attempt to use one of these words as a variable name, the program would show an error.