My last post was about a similar subject only with an emphasis on generating an evenly distributed set of random numbers that existed between a minimum and maximum value.

I found this post from Jackson Dunstan about a repeatable random class written in AS3.  In that post, he mentioned that it could easily be ported to Javascript or other languages — and he was right.  Here is that class written in Javascript and as far as I can tell, it does indeed produce a repeatable random set of numbers.

His class works by taking an initial seed number, performs a simple mathematical calculation, and then returns it before making it the new seed number, and starting the cycle over. The result is a set of random numbers that are repeated based on the starting seed number.

A technique such as this is mainly used for video games but it could also be useful in web development to randomly place objects on a page. This code doesn’t do much of anything by itself but is a good jumping off point. See a working example at the bottom of this page.

» Read more: Another look at Repeatable Random