Error on canvas

Question

Why doesn't the following code work???
The id is correct on the HTML file

const canvas = document.getElementById("c");
console.log(canvas);
canvas.height = innerHeight;
canvas.width = innerWidth;
canvas.style.backgroundColor = "black";
var c = canvas.getContext("2d");
c.beginPath();
c.arc(50, 50, 100, 0, 2*Math.Pi,false);
c.strokeStyle = "orange";
c.stroke();

Answer 1

Try wrapping the code inside an onload event listener on window. Something like
window.onload = () = { code... }
The script on Sololearn loads before the all HTML is parsed so the element with id "c" might not exist at the time your code runs.

Answer 2

It was the problem indeed now it works just fine
Thank you a lot