Remove duplicates from array

by alex_o

JavaScript

function removeDuplicates(arr){
	var res = [],
  		helper = [],
      currEl,
      length = arr.length;
    
  for(var i=0; i< length; i++){
  	currEl = arr[i];
  	if(!helper[currEl]){
    	res.push(arr[i]);
      helper[currEl] = true;
    }
  }
  
  return res;
}


(function checkArr(){
	var str = prompt('enter array');
  alert(removeDuplicates(str.split(', ')));
})();