title: delete or override const variables in javascript Harmony / ECMAScript 6
body: <p>Reading and tinkering with the new features offered by ECMAScript 6.</p>
  
  <p>The new 'const' statement for writing constant variables is a nifty feature, which adds features to an already interesting update.</p>
  
  <p>The variable is created as read-only, and once it is stated it can't be overridden.</p>
  
  <p>EDIT: A consequent problem arise, for example, when testing code on the console. Running a script containing a const definition twice, would lead to an error, breaking the execution.</p>
  
  <p>What if I want to <em>release</em> that keyword? Is there any way to unset or delete the variable?</p>
  
  <p>I've read in <a href="https://stackoverflow.com/questions/1596782/how-to-unset-a-javascript-variable">this post</a> that this is actually a problem which affects the <em>var</em> statement as well, because the environments where the variables are created are different on many level of abstraction. </p>
  
  <p>How ECMAScript 6 intend to address this issue?</p>