var area

var xlen

var ylen

function setup() {

  createCanvas(400, 400);

  frameRate(30)

}

​

function draw() {

  background(0);

  size=size+1

  for (var x=0; x<=width; x+=size) {

  for (var y=0; y<=height; y+=size) {

   fill(random(255),random(255),random(255))

    rect (x,y,size,size)

   }

  }

  if (size==width) {

  size=2

  }

  xlen= width/size

  ylen= height/size

  area=xlen*ylen

  console.log(area)

}