title: How to get all unique elements which didn't duplicated in array
body: <p>I have an array which has duplicated values and I want to filter that array with the only unique elements. All values which have been duplicated or occurring more than 1 times should be excluded</p>
  
  <p>Example: I have an array x which has these values</p>
  
  <pre><code>x = [1, 2, 3, 4, 2, 3]
  </code></pre>
  
  <p>Expected Result is</p>
  
  <pre><code>[1, 4]
  </code></pre>