title: What do I ask in this if condition?
body: <p>I got the following code:</p>
  
  <pre><code>if (a &amp; 1){
  ...
  }
  </code></pre>
  
  <p>But when do I go in the if condition? There is no <code>==</code> or <code>!=</code>. I am very confused...
  When do I go in the if condition an when do I not.</p>