title: Hard Copy vs Shallow copy javascript
body: <p>This may be an old question but I'm really curious about the nature of copying objects by reference as an assignment in javascript. </p>
  
  <p>Meaning that if </p>
  
  <pre><code>var a = {}; 
  var b = a;
  a.name = "Renato";
  console.log(b); 
  Object {name: "renato"}
  </code></pre>
  
  <p>I'm kind of new to javascript and this really caught my attention to have a shallow copy as a default for Object assignment. I searched that in order to create a hard copy, you have to create a mixin. I was wondering why was this chosen as the default since it's transformation seems to be very implicit. Thanks!</p>