title: Redeclaring a javascript variable
body: <p>In <a href="http://www.w3schools.com/js/js_variables.asp" rel="noreferrer">this</a> tutorial there is written:</p>
  
  <p><code>If you redeclare a JavaScript variable, it will not lose its value.</code></p>
  
  <p>Why should I redeclare a variable? Is it practical in some situations?</p>
  
  <p>thank you</p>