​

// Code that describes the starting position of a shape that will move

let x = 50;

let y = 50; // this was missing

​

function setup() { // Runs once at the beginning. Used to set up initial properties, like canvas size and initial variables.

  // Code to create a 400x400 canvas

  createCanvas(400, 400);

​

  // Code to draw a gray background

  background(220);

}

​

function draw() { // Runs continuously, 60 times per second by default. Used to create animations or update visuals.

  // Code to draw the shape

  rect(x, y, 50, 50);

​

  // Code that describes mouse interaction

  if (mouseX > x && mouseX < x + 50) {

    x = mouseX;

  }

​

  // Code that changes the position of the shape over time

  x++;

}