Introduction To Java​Script​Core On iOS

Nate Cook on ranking of programming language popularity (data from redmonk):

“…the only other language allowed to run natively on iOS: the current champion, JavaScript.”

Nate goes on to provide a solid introduction to working with iOS and Javascript, including JSContext, the environment in which JavaScript runs.

As an aside on the redmonk ranking:

“The idea is not to offer a statistically valid representation of current usage, but rather to correlate language discussion (Stack Overflow) and usage (GitHub) in an effort to extract insights into potential future adoption trends.”

If you are interested in another index of programming languages, have a look at the TIOBE Index, where JavaScript is listed as #10 for 2014.