title: How to copy matching properties from one object to another
body: <p>I have these two objects:</p>
  
  <pre><code>obj1 = {a: '', b: ''}
  obj2 = {a: '1', b: '2', c: '3'}
  </code></pre>
  
  <p>I want to copy all matching properties from <code>obj2</code> to <code>obj1</code>. What is the best way of doing that in Typescript?</p>