title: Adding methods to default Objects in obj c and swift
body: <p>Hello I have been looking around for this answer and I've come across multiple articles but none of them have given me a straight answer. Lets say we have Object Date in objective C if I want to add methods to this object I would create a file similar to this:</p>
  
  <p>obj c:</p>
  
  <pre><code>@interface Date (AdditionDate)
  //methods
  @end
  </code></pre>
  
  <p>in swift it seems to be a little different we do the following:</p>
  
  <pre><code>extension Date {
  //methods
  }
  </code></pre>
  
  <p>is this correct? Thank you for your help!!</p>