I want a right arrow to change variable, but it will not work

Question

When I hit the right arrow, it does not change the variable. Here's my code:

var squareX = 10;
document.addEventListener("keypress", function(e) {
  if (e.keyCode === 39) {
    squareX += 10;
  }
});

Answer 1

Use keydown instead of keypress:

document.addEventListener("keydown", function(e) {
    if (e.keyCode === 39) {
       squareX += 10;
    }
});

That did the trick for me!