For Loop While. Using p5.js library.
function setup() {
createCanvas(640, 360);
}
function draw() {
background(0);
var x = 16;
while (x <= width) {
fill(255, 0, 0);
ellipse(x, 120, 32, 32);
x = x + 20;
}
for (x = 16; x <= width; x += 20) {
fill(0, 0, 255);
ellipse(x, 240, 32, 32);
}
}