passi9412

Hi there, I am very new to javascript and trying to keep the code readable. I want my timeline to be in a separate function and being played and reversed on a button click. However, the animation only fires forward, but never backwards and I cant get my head around it. If I put the timeline into the constructor method it suddenly works, but not if putting it into a separate function. The codepen is a very simplified version for the main issue. I'd glad if someone could lend me a helping hand. If you have better suggestions how to structure the code, I am very open to learn something. Just want to write it as clean as possible.