On http://www.eclipse.org/webtools/jsdt/ it says that the most recent version is 3.4. My Eclipse version is 4.2 Juno.
In Help → Install new software... when I search for it I only get the 1.4 JSDT. I've got the following software sites enabled:
Juno http://download.eclipse.org/releases/juno Enabled
Mylyn for Eclipse Juno http://download.eclipse.org/mylyn/releases/juno Enabled
The Eclipse Project Updates http://download.eclipse.org/eclipse/updates/4.2 Enabled
So how do I install the 3.4 JSDT?
You can install all or part of Eclipse WTP in to your current Eclipse. To install just JSDT open 'Help > Install New Software...'. In "Work with" choose your main Eclipse site ( http://download.eclipse.org/releases/luna for Eclipse Luna). Click Next> to proceed with the install.
With this set of good old features added to a more powerful and nicer edition and debug of Web files, the Eclipse IDE now shine again as a great ready-to-use IDE for Web and JavaScript development. It can now be considered for many use-cases by Web or Node.
JSDT was only released under Web Tools Platform (WTP) version 3.4, this doesn't mean that the version of the JSDT itself has version 3.4 too.
You could probably update your WTP Version to 3.4. The repository could also be found under http://download.eclipse.org/webtools/repository/juno
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