title: How does Powershell display variable operation work?
body: <p>In powershell  </p>
  
  <pre><code>$a = 4;
  $a  
  </code></pre>
  
  <p>will write 4 to the output stream.</p>
  
  <pre><code>Write-Ouput $a 
  </code></pre>
  
  <p>writes 4 to output stream</p>
  
  <p>Can you explain which operation is better performance wise if all I want to do is write variables to output stream?</p>