Can anyone fix my error in js

Question

https://code.sololearn.com/W4S6qe7x7Nri/?ref=app

Answer 1

Line 2:
It should be canvas.getContext("2d")
And
window.onload = () =>{

//Put your all JS code here

}

Answer 2

https://code.sololearn.com/WfYA03TOD506/?ref=app