let colColors = [];

let turnRed = [];

​

function setup() {

  createCanvas(400, 400);

​

  for (let i = 0; i < 10; i++) {

    colX[i] = i * (width / 10);

    colColors[i] = color("white");

    turnRed[i] = false;

  }

}

​

function draw() {

  background(220);

​

  for (let i = 0; i < 10; i++) {

    if (turnRed[i]) {

      colColors[i] = color("red");

    } else {

      colColors[i] = color("white");

    }

    fill(colColors[i]);

    rect(colX[i], 0, width / 10, height);

  }

}

​

function mousePressed() {

  for (let i = 0; i < 10; i++) {

    if (mouseX > colX[i] && mouseX < colX[i] + 40) {

      turnRed[i] = !turnRed[i];

    }

  }

}

​