HOME HTML5 CSS3 JAVASCRIPT JQUERY BOOTSTRAP5 v4.6 PHP7 SQL REFERENCES EXAMPLES FAQ SNIPPETS Online HTML Editor
JAVASCRIPT BASIC
JS Introduction JS Getting Started JS Syntax JS Variables JS Generating Output JS Data Types JS Operators JS Events JS Strings JS Numbers JS If…Else JS Switch…Case JS Arrays JS Sorting Arrays JS Loops JS Functions JS Objects
JAVASCRIPT & DOM
JS DOM Nodes JS DOM Selectors JS DOM Styling JS DOM Get Set Attributes JS DOM Manipulation JS DOM Navigation
JAVASCRIPT & BOM
JS Window JS Screen JS Location JS History JS Navigator JS Dialog Boxes JS Timers
JAVASCRIPT ADVANCED
JS Date and Time JS Math Operations JS Type Conversions JS Event Listeners JS Event Propagation JS Borrowing Methods JS Hoisting Behavior JS Closures JS Strict Mode JS JSON Parsing JS Error Handling JS Regular Expressions JS Form Validation JS Cookies JS AJAX Requests JS ES6 Features
JAVASCRIPT EXAMPLES
JS Practice Examples JS FAQ's Answers
JAVASCRIPT REFERENCE

JavaScript Reserved Keywords

This section contains a list of all keywords that are reserved in JavaScript.

What are Reserved Keywords?

JavaScript has a number of reserved keywords. These are the words that you cannot use as identifiers (variable names, function names, and loop labels) in your JavaScript programs.

Reserved Keywords in ECMAScript 5 (ES5)

The following list shows the keywords that are reserved in ECMAScript 5. It also includes keywords that are reserved for future as well as keywords that are disallowed in strict mode.

arguments sm break case catch class fr const fr continue debugger default delete do else enum fr eval sm export fr extends fr false finally for function if implements sm import fr in instanceof interface sm let sm new null package sm private sm protected sm public sm return static sm super fr switch this throw true try typeof var void while with yield sm

Note: The keywords arguments and eval are not strictly reserved keywords, but they are treated like keywords in strict mode, so they cannot be used as identifiers. Additionally, the keywords null, true, and false cannot be used as identifiers in ECMAScript.

Reserved Keywords in ECMAScript 6 (ES6)

The following list shows the keywords that are reserved in ECMAScript 6. It also includes keywords that are reserved for future as well as keywords that are disallowed in strict mode.

arguments sm await break case catch class const continue debugger default delete do else enum fr eval sm export extends false finally for function if implements sm import in instanceof interface sm let sm new null package sm private sm protected sm public sm return static sm super switch this throw true try typeof var void while with yield

Future Reserved Keywords in Older Standards

The following list shows the keywords that were reserved as future keywords by the older ECMAScript specifications (before ECMAScript 5 or ES5).

abstract boolean byte char double final float goto int long native short synchronized throws transient volatile

Note: For optimal backwards compatibility, you should better avoid using all the keywords shown on this page as variable names or property names in your JavaScript code.

Previous Page Next Page
Bootstrap UI Design Templates Property Marvels - A Leading Real Estate Portal for Premium Properties

Is this website helpful to you? Please give us a like, or share your feedback to help us improve. Connect with us on Facebook and Twitter for the latest updates.

About Us

Our Story Terms of Use Privacy Policy

Contact

Contact Us Report Error Advertise

Interactive Tools

Copyright © 2024 Tutorial Republic. All Rights Reserved.