title: What is "Structural Typing for Interfaces" in TypeScript
body: <p>In his <a href="http://blog.markrendle.net/2012/10/02/the-obligatory-typescript-reaction-post" rel="noreferrer">blog post</a> about TypeScript, Mark Rendle is saying, that one of the things he likes about it is:</p>
  
  <blockquote>
    <p>"Structural typing for interfaces. I really wish C# could do that"</p>
  </blockquote>
  
  <p>What did he mean by that?</p>