title: Javascript ||, how to compare multiple variables value?
body: <p>How to right this syntax correctly:</p>
  
  <pre><code>if (tipoTropaPrioritaria[m] || troopsCount[m] || availableTroops[m]) == ("null" || "undefined") {
  
  ...
  
  }
  </code></pre>
  
  <p>(to check if any of the first 3 variables is null or undefined)</p>