Jquery check if array contains duplicate string

Question

How to check if array contains a duplicate string , i have validateArray = [\'sa\',\'sa\',\'yu\'] i have used the following function from SO but same not working for me.

Answer 1

Please try this, if the sort function is not working well :

    var all_list= ['sa','sa','yu'] 
    var duplicates_list = [];
    var unique_list = [];
    $.each(all_list, function(key, value){
            if($.inArray(value, unique_list ) == -1){
                unique_list.push(value);
            }else{
                if($.inArray(value, duplicates_list ) == -1){
                    duplicates_list.push(value);
                }
            }
    });

//duplicated elements 
console.log(duplicates_list )