📘The game loop

A game lives to the beat of a "tick": a function called in a loop (by setInterval) that moves the world one small step forward.

Here, the obstacle races towards the car: on each tick, its x shrinks. We test the tick() function directly — animation is just tick() repeated!

var obstacle = {x: 300};
function tick() {
  obstacle.x = obstacle.x - 5;
}
setInterval(tick, 50);