Multiple random walkers - OpenProcessing

mySketch
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circleArray = []
const step = 3
​
function setup() {
  createCanvas(600, 600);
  background('grey');
  frameRate(20)
  colours = [
    "#fe4365",
    "#fc9d9a",
    "#f9cdad",
    "#c8c8a9",
    "#83af9b"
  ]
​
​
  for (let i = 0; i < 1000; i++) {
    let c = {
      x: random(0, 600),
      y: random(0, 600),
      colour: random(colours)
    }
    circleArray.push(c)
  }
}
​
function draw() {
  drawMultipleWalkers()
  moveMultipleWalker()
}
​
function drawMultipleWalkers() {
  for (let c of circleArray) {
​
    circle(c.x, c.y, 10);
    fill(c.colour);
  }
}
​
function moveMultipleWalker() {
  for (let c of circleArray) {
    c.x += random(-step, step)
    c.y += random(-step, step)
  }
​
}