JavaScript has some reserved words you should know before you begin coding. The following table contains a list of JavaScript reserved words, which cannot be used as JavaScript variables, functions, methods, loop labels, or object names.
| abstract | boolean | break |
| byte | case | catch |
| char | class | const |
| continue | debugger | default |
| delete | do | double |
| else | enum | export |
| extends | false | final |
| finally | float | for |
| function | goto | if |
| implements | import | in |
| instanceof | int | interface |
| 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 |