One of the greatest strengths of the language when used for client-side code is that it largely enforces open source by virtue of the architecture. There's a lot of minified and obfuscated code out there, but even that can be deconstructed, and the amount of clear and well-documented code out there pretty much ensures that you can find tips to solve any problem you have, if not an open source library to handle it for you. Add the network effect from all the people using the language, and the resulting wealth of discussions widely available on its every aspect, and it's difficult to beat.