title: Changing value of class variable
body: <p>I started OOP few days ago so i'm not experianced. I'm wondering is it any chance to change value of class property in order to affect on all objects, which use that class?</p>
  
  <p>Example:</p>
  
  <pre><code>function Balloon(ID){
      this.ID = ID;
      this.speed = 1; 
  }
  </code></pre>
  
  <p>Let's say I have 5 Balloon objects. And now i want to change all of their <strong>speed</strong> values to 2 without using for loop.</p>