Conditional Statement Comparison Example

sketch.js

var y;

function setup() {
	createCanvas(windowWidth, windowHeight);
	y =	0;
}

function draw() {
	background(0);
	ellipse(width/2, y, 50, 50);

	if (y > height) {
		y = 0;
	}
	
	y = y + 1;

}