javascript array to string

                var names = $('input[type=hidden][name=\'option_code[]\']');
                var grparr = new Array();
                for(var i=0; i<total; i++){
                    grparr[i] = $(names.get(i)).val();
                }
                if(grparr.length>0){
                    var codes = grparr.toString();
                }else{
                    var codes = '';
                }

 

 

var codes=grparr.toString();

console.log(codes);

 

[1],[2],[3],[4]

=>

1,2,3,4