The latest version of the JavaScript language is 1.8.5, released to the world at large on July 27, 2010.
The 1.8.5 update mainly served to provide full compliance to the ECMAScript 5 standard from December 2009, including "strict mode" and a number of other features.
If your only use of JavaScript is in a web browser (which accounts for most, though not all, of its usage worldwide) you should not have to worry about which version of the language is being used. Most browsers do not immediately support the latest versions of the language, and you are unlikely to find any web content that actually requires the use of any features from beyond JavaScript 1.5.
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