Echo JS 0.11.0

I hardly understand the point of this article. Methods like forEach and map have a great value when it comes to readability and maintainability. But if you need performances, you don't use a callback function, period: you use a good-ol' for loop, because function calls are expensive.

But then again, if you need performances you might not want to do that in JavaScript to begin with. At most, you do that in C++ and convert it with Emscripten.