title: Empty value for int property
body: <p>I got the following class:</p>
  
  <pre><code>function Corpus(name){
  
      this.name=name; // A string
      this.recordings = []; // An array to fill
      this.num = ... ; // A int number to set later
  
  }
  </code></pre>
  
  <p>What is the best default value for my int value (num), when it is not defined ? </p>