title: Array with numbers 1-20
body: <p>I'm brand new to javascript.  I was working through a problem earlier where I needed an array that included the numbers 1 thru 20.</p>
  
  <p><strong>I did this with the following:</strong></p>
  
  <pre><code>var numberArray = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20];
  </code></pre>
  
  <p><strong>QUESTION:</strong></p>
  
  <p>I can't help but think that this is not efficient (and certainly not scalable).  Is there a way to create an array that automatically populates with sequential values between 1 and 20, or 1 and 1000 for instance?</p>