title: Is there any good example of use cases for angular.identity()?
body: <p>According to the documentation</p>
  
  <pre><code>A function that returns its first argument. This function is useful when writing code in the functional style.
  </code></pre>
  
  <p>I am wondering where I can find a good example of such use case - writing code in functional style in an angular app. 
  Thanks</p>