title: Several condition for FOR loop with logical AND(&&) in JavaScript
body: <p>need your help. I need to check whether it was entered number between 1-7 or not and check whether is empty line or not. What's wrong in my code below:</p>
  
  <pre><code>let number = parseInt(prompt('Choose number from 1 to 7'));
      for ( ; (!number) &amp;&amp; (number &gt; 7); ) {
          number = parseInt(prompt('Choose from 1 to 7'));
      }
  mood(number);
  </code></pre>
  
  <p>variable <strong>number</strong> goes for some function</p>