title: Can (x++ !== x) && (x++ === x); return true?
body: <p>A friend of mine come across this question at an interview </p>
  
  <p>Find a value of x that will make this function return true</p>
  
  <pre><code>function f(x) {
      return (x++ !== x) &amp;&amp; (x++ === x);
  }
  </code></pre>
  
  <p>The interviewer added: x should be <strong>5</strong> <strong>characters</strong> max</p>
  
  <p>I found multiple answers of 7 characters:</p>
  
  <pre><code>[["2**53-1"],["2*3**33"],["2-5**23"],["5**23-2"],["3**33*2"]]
  </code></pre>
  
  <p>But I couldn't find the one with 5 characters. (not even 6) . I was doubting that there is a solution that has 5 characters. But after research, I found this site: <a href="https://alf.nu/ReturnTrue" rel="noreferrer">https://alf.nu/ReturnTrue</a> that offers the same challenge and  it turns out there is (are) solution(s) with 5 characters:</p>
  
  <p><a href="https://i.stack.imgur.com/fCVZv.png" rel="noreferrer"><img src="https://i.stack.imgur.com/fCVZv.png" alt="enter image description here"></a></p>
  
  <p>Can someone please help to know what is it?</p>