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 |
Const is a keyword that indicates a constant. It describes an entity that cannot be changed at runtime. We cannot reassign a constant. With constants we lose the ability to modify variables at runtime and we gain run-time validation.
One of t....
There are generally 3 types of JavaScript date input formats:There are generally 3 types of JavaScript date input formats:
The strict context prevents some actions and throws more exceptions. Strict mode changes previously accepted "bad syntax" into errors. Strict mode will for example prevent using undeclared variables. The "use strict" directive was new in ECMAScript version 5.
With operator precedence we describe the order in which operations are executed when expressions are evaluated. The operations with a higher precedence will run before the operations with a lower precedence. For example, multiplication is performed before addition.
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