cn-sensei-guides/02-yellow/04-02-ballon-protect.js

/**
This activity is a simple extension of the previous lesson in flipDirection, adding the moveForward() function.
 */

//**************circle_1 Object - Update Every Frame*****************//
$this.moveForward(1); // move forward at a speed of 1 
if ($this.isTouching(balloon)) { 
    // if the circle touches the balloon 
    balloon.remove(); // remove the balloon. 
} 
if ($this.x() < 30) { 
    // if the circle is too far left 
    $this.flipDirection(); // flip its direction. 
}

//***************circle_1 Object 0 Mouse Button Up Event************//
$this.flipDirection();

//*****************circle_2 Object - Update Every Frame**************//
$this.moveForward(1);

if($this.isTouching(balloon)){
    balloon.remove();    
}

if($this.x() > 770){ //review x , y so ninja knows the coordinates referenced
    $this.flipDirection();
}

//***************circle_2 Object 0 Mouse Button Up Event************//
$this.flipDirection();