var fadeAmount = 1

​

function setup() {

  createCanvas(400, 400);

  textSize(100)

  fade = 0

}

​

function draw() {

  background(220);

  fill(255, 0, 0, fade)

  text("hello", 100,100)

  if (fade<0) fadeAmount=1; 

  if (fade>255) fadeAmount=-10; 

  fade += fadeAmount; 

  print(fade)

}