Remove duplicates in Javascript Array

array-filter.js

(function() {
 
 var duplicatesArray = ['stop', 'pause', 'resume', 'stop'];
 
 // Filter function returns a new array
 var uniqueArray = duplicatesArray.filter(function(ele, pos) {
  return duplicatesArray.indexOf(ele) === pos;
 });
 
 // Expected Output: ['stop', 'pause', 'resume']
 console.log(uniqueArray);
 
})();