title: filter out a unique word in array in javascript
body: <p>Hi very new to javascript but how do I filter out words that occur once in the array please?</p>
  <p>If my code would say</p>
  <pre><code>function uniqueWord(word) {
   
  }
  
  const result = uniqueWord([cat, dog, cat, cow])
  console.log(result)
  </code></pre>