This is the second tutorial on the road to generating script files for After Effects. I read the comments from Part 1 stating that those are expressions, not actual Javascripts. I figured, to learn what Javascript does from scratch, you have to understand expressions first, because you can immediately see what the changes do. There will be one more tutorial on placing layers with expressions, then we’ll move on to actual scripts. In this tutorial you will learn how for-loops can help analyzing several frames in order to customize effects.