title: Best way to null check in Kotlin?
body: <p>Should I use double <code>=</code>, or triple <code>=</code>?</p>
  
  <pre><code>if(a === null)  {
  //do something
  }
  </code></pre>
  
  <p>or </p>
  
  <pre><code>if(a == null)  {
  //do something
  }
  </code></pre>
  
  <p>Similarly for 'not equals':</p>
  
  <pre><code>if(a !== null)  {
  //do something
  }
  </code></pre>
  
  <p>or </p>
  
  <pre><code>if(a != null)  {
  //do something
  }
  </code></pre>