title: Meaning of " $N || {}" in Javascript
body: <p>I did C( and a bit of C++)programming all my life till now and started to learn Javascript recently.</p>
  
  <p>I am having tough time to understand some of the Javascript Syntax.</p>
  
  <p>Can someone explain me the following line :</p>
  
  <pre><code>window.$N = $N || {};
  </code></pre>
  
  <p>Thanks!</p>