title: Checking if multiple variables is not null, undefined or empty in an efficient way
body: <p>At the moment I have an if condition like this:</p>
  
  <pre><code>if(
    (variable != null &amp;&amp; variable != '' &amp;&amp; !variable) &amp;&amp;
    (variable2 != null &amp;&amp; variable2 != '' &amp;&amp; !variable2) &amp;&amp;
    (variable3 != null &amp;&amp; variable3 != '' &amp;&amp; !variable3)
    //etc..
  )
  </code></pre>
  
  <p>I need to use it to check if multiple variables have value (were not left out), but I feel like this is a messy solution and wanted to ask if there is a more efficient way? Maybe additional checks as well?</p>