// from the left edge of the canvas

let x = 10;

​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(220);

  // Move across the screen

  x++;

​

  strokeWeight(5);

​

  // Draw 4 points, evenly spaced

  // point(x, 80);

  // point(x + 50, 80);

  // point(x + 100, 80);

  // point(x + 150, 80);

​

  // Use a loop to do the same thing as above

  for (let i = 0; i < 4; i++) {

    // Each point is successively i*50 

    // to the right of the left-most point

    point(x + (i*50), 80);

    // You can try this too

    //point((x*i) + 50, 80);

    // Why doesn't this work?

    // x += 50;

    // point(x, 80);

  }

}