Does JavaScript have a built in stringbuilder class?

Question

I see a few code project solutions.

But is there a regular implementation in JavaScript?

Answer 1

I just rechecked the performance on http://jsperf.com/javascript-concat-vs-join/2. The test-cases concatenate or join the alphabet 1,000 times.

In current browsers (FF, Opera, IE11, Chrome), "concat" is about 4-10 times faster than "join".

In IE8, both return about equal results.

In IE7, "join" is about 100 times faster unfortunately.