String concatenation vs string buffers in Javascript

Question

I was reading this book - Professional Javascript for Web Developers where the author mentions string concatenation is an expensive operation compared to using an array to s

Answer 1

**EDIT: I assume people are still viewing this post--but it has been 3+ years, so it is in your best interest to just view: http://jsperf.com/string-concatenation/14

View the changes of this post to see what it used to say.