Just the other day during a JavaScript&#x2F;React interview I was asked how a HashMap was implemented.<p>At this point it&#x27;s only being used for its Computer Science signalling value. JavaScript doesn&#x27;t even have true HashMaps, and it&#x27;s unlikely you&#x27;ll find yourself implementing them while building a web app.<p>It&#x27;s just one example of poor interviewing practice but it&#x27;s not the only problem.