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function setup() {
createCanvas(320, 240);
noStroke();
}
let xP = 20;
let xChange = 1;
function draw() {
background(255, 230, 246);
if (xP > 100 && xP < 200) {
fill(255, 0, 0)
} else {
fill(0, 125, 62);
}
ellipse(xP, 20, 15, 15);
xP = xP + xChange;
// || or
if (xP > 320 || xP < 0) {
xChange *= -1;
}
}