title: Javascript: Only using specific parameter in function
body: <p>I think it is rather a beginner's question: How can I address a specific parameter in a function and ignore the others?</p>
  
  <p>Example:</p>
  
  <p><a href="http://jsfiddle.net/8QuWj/" rel="nofollow">http://jsfiddle.net/8QuWj/</a></p>
  
  <pre><code>function test(para_1, para_2, para_3) {
     if (para_3 == true) {
      alert('only the third parameter was successfully set!');
     }
  }
  
  test(para_3=true);
  </code></pre>
  
  <p>I want to individually decide whether or not I use a certain parameter in a function or not.</p>