Flash cards
Review the key moves
1/3
Core idea
What is the main idea behind JavaScript Reserved Words?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Order
Put the learning moves in the order that makes the concept easiest to apply.
JavaScript Objects, Properties, and Methods
Removed Reserved Words
JavaScript Reserved Words
| abstract | arguments | async * | 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 |
| function | 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 |
| using * | var | void | volatile |
| while | with | yield * |
Words marked with* have been added to JavaScript from after 2015.
You can read more the newest JavaScript versions in JS News 2025-2015 .
Removed Reserved Words
| abstract | boolean | byte | char |
|---|---|---|---|
| double | final | float | goto |
| int | long | native | short |
| synchronized | throws | transient | volatile |
JavaScript Objects, Properties, and Methods
| Array | Date | eval | function |
|---|---|---|---|
| hasOwnProperty | Infinity | isFinite | isNaN |
| isPrototypeOf | length | Math | NaN |
| name | Number | Object | prototype |
| String | toString | undefined | valueOf |
Java Reserved Words
| getClass | java | JavaArray | javaClass |
|---|---|---|---|
| JavaObject | JavaPackage |
Other Reserved Words
JavaScript can be used as the programming language in many applications.
| alert | all | anchor | anchors |
|---|---|---|---|
| area | assign | blur | button |
| checkbox | clearInterval | clearTimeout | clientInformation |
| close | closed | confirm | constructor |
| crypto | decodeURI | decodeURIComponent | defaultStatus |
| document | element | elements | embed |
| embeds | encodeURI | encodeURIComponent | escape |
| event | fileUpload | focus | form |
| forms | frame | innerHeight | innerWidth |
| layer | layers | link | location |
| mimeTypes | navigate | navigator | frames |
| frameRate | hidden | history | image |
| images | offscreenBuffering | open | opener |
| option | outerHeight | outerWidth | packages |
| pageXOffset | pageYOffset | parent | parseFloat |
| parseInt | password | pkcs11 | plugin |
| prompt | propertyIsEnum | radio | reset |
| screenX | screenY | scroll | secure |
| select | self | setInterval | setTimeout |
| status | submit | taint | text |
| textarea | top | unescape | untaint |
| window |
HTML Event Handlers
In addition you should avoid using the name of all HTML event handlers.
| onblur | onclick | onerror | onfocus |
|---|---|---|---|
| onkeydown | onkeypress | onkeyup | onmouseover |
| onload | onmouseup | onmousedown | onsubmit |