title: Returning the other argument of 2 possible arguments without using conditions
body: <p>For example, if I have a function that is guaranteed to receive either 5 or 7 as an argument, I want the function to return 5 if received 7 and 7 if received 5 without using any conditions. </p>
  
  <p>I was asked this in an interview and was pretty stumped,
  thanks.</p>