In JavaScript there are words that you should know before you begin coding. These words are called reserved words or sometimes also reserved identifiers. In JavaScript these words cannot be used as variables, labels, methods, loop labels, object names or function names.
The following table present a list of JavaScript reserved words.
| 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 |
Some of the reserved words are removed from the ECMAScript 5/6 standard. This list contains removed reserved words.
| abstract | boolean | byte | char |
| double | final | float | goto |
| int | long | native | short |
| synchronized | throws | transient | volatile |
Some worlds are allowed but should still be avoided.
| Array | Date | eval | function |
| hasOwnProperty | Infinity | isFinite | isNaN |
| isPrototypeOf | length | Math | NaN |
| name | Number | Object | prototype |
| String | toString | undefined | valueOf |
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