​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(220);

  textSize(16);

  let rectSide = width/GRID_SIZE;

  for (let x = 0; x < GRID_SIZE; x += 1) {

    for (let y = 0; y < GRID_SIZE; y +=1 ) {

      let xPos = x*rectSide;

      let yPos = y*rectSide;

      rect(xPos, yPos, rectSide, rectSide);

      text('x: ' + x + ' y: ' + y, xPos, yPos+ 20);

    }

  }

}