let rng = [];

  if (stop===undefined) [start, stop] = [0, start];

  for (let i=start; step>0 ? i<stop : i>stop; i+=step) rng.push(i);

  return rng;

}

​

function flipped(cell){

  return {row:cell.col, col:cell.row}

}

​

function grid(i, numColumns){

  return {row:Math.floor(i/numColumns), col:i%numColumns}

}

​

function setup() {

  createCanvas(600, 400);

  background(0)

  noStroke()

  fill(255)

  translate(20, 20)

  let colSpacing = 25

  let rowSpacing = 25

  for (const i of range(40)){

    let cell = grid(i, 10)

    let x = colSpacing * cell.col

    let y = rowSpacing * cell.row

    circle(x, y, 15)

  }

}

​