How to use object collision in a game?

Question

Hey, im trying to make a little game.. But ill need to make object detection for the walls, but i cant get it too work.. https://code.sololearn.com/W9LodTtqQmyn/#js This is a code that works in https://codepen.io/zer0/pen/JxxYgQ but not in sololearn, can anyone help me with how thats possible?

Answer 1

It's working in Sololearn for me.

Have you completed the JS tutorial?