Javascript Array uniquer()

var toEnter = (1,2,3,3,3,4,5,6,'this','this','that');

Array.prototype.uniquer = function () {
  var uniqueValues = [];
  var checkUniqueValues = function (toBeChecked) {   //takes current element of arr and compares to elements in uniqueValues
   /*from   w w w .j a va2  s. c o m*/
   for (var i = 0; i < uniqueValues.length; i++) {
    if (toBeChecked === uniqueValues[i]) {
     return true;
    }    
   }
   return false;
  
  };
  
  for (var i = 0; i < this.length; i++) { //spins through arr

   if(checkUniqueValues(this[i]) === false) { //calls checkUniqueValues for each element of the array
    uniqueValues.push(this[i]); //if checkUniqueValues returns false, current element of arr is pushed to uniqueValues
   }
  }
  return uniqueValues;
};


var testArray = [1,2,3,3,3,3,3]

var finalProduct = testArray.uniquer();

module.exports.finalProduct = finalProduct;