p5js-for-loop

function setup(){

  createCanvas(401, 401)

}

​

function draw() {

  print(2)

  var a=1;

  //color of each individual square

  var c=0;

​

  for (var x=0; x<400; x=x+50) {

    //alternates the fill between black and white

    a=a*-1;

    for (var y=0; y<400; y=y+50) {

      //alternates the fill between black and white

      a=a*-1;

      if (a<0) {

        //set color to black

        c=0;

      }

      if (a>0) {

        //set color to white

        c=255;

      }

      //changes fill to c

      fill(c);

      //draws the checkers square

      rect(x, y, 50, 50);

    }

  }

}