[heavenlyblue]

Um what?

- browsers: used since the 90s because there's no other alternative

- node.js: created because JS is used in browsers and it's easier to write code in a single language for browsers and servers

- Cocos2d: you're clearly lying as the only place where JS is mentioned is Cocos2d-html, as there's again - no alternative

- enyo JS: again, used clearly due to the fact that modern - browsers are available for all of the modern platforms

- Weex, NativeScript: typical "native app" libraries which use a webkit pane for most of the rendering, again - javascript here is circumstantial since you can't choose anything else

- GNOME Shell, Kinoma XS6: OK. These are the only ones that make any sort of a strong point in your message; but as far as it goes - modern linux distros are moving to Python for systems programming anyway. So learning JS here is a miss.