title: Reverse XOR operator in JavaScript?
body: <p>I have 2 variables, <code>x</code> and <code>y</code>.</p>
  
  <p>I am doing <code>z = x^y</code>.</p>
  
  <p>Now assuming I know only <code>z</code> and <code>y</code>, How can I get <code>x</code> back? Is there an opposite to <code>^</code> in JavaScript?</p>