​

let sentence = "A rose is a rose is a rose";

let num = 0;

​

function setup() {

  createCanvas(400, 400);

  textSize(18);

  fill(255);

}

​

function draw() {

  background(185, 20, 222);

  text(sentence.substring(0, num), 100, height / 2);

  if (num < sentence.length){

  num++;

  }

}

​

function mousePressed() {

  num = 0;

}