Javascript: Random Pattern Generator

CSCI E3: Javascript Extra Credit#1:
This video accompanies my extra credit#1 submission for the Harvard Extension School Intro to Javascript class. It describes the basic coding structures used to create a random pattern generator whose complexity can be gauged.

[ajs]

I understand that this post is almost 6 years old, and that it is long forgotten classwork, but this was exactly what I was looking for. Thanks.