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1. The JavaScript Language > 1.8. Versions of JavaScript

Versions of JavaScript

Netscape has defined a number of versions of JavaScript. Microsoft has released more-or-less compatible versions under the name “JScript,” and the ECMA standards body has released three versions of a JavaScript standard named “ECMAScript”. The following paragraphs describe these various versions, and explain how they relate to each other. Each entry in the reference section contains availability information that documents the version of JavaScript in which a feature was introduced.

JavaScript 1.0

The original version of the language. It was buggy and is now essentially obsolete. Implemented by Netscape 2.

JavaScript 1.1

Introduced a true Array object; most serious bugs resolved. Implemented by Netscape 3.


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