Get option group from arraylist

get-option-group.js

function getOptionGroup = function(jsonList){
        var group;
        var groups = {};
        var indexGroup = 0;
        var optionsGroup = [];
        $.each(jsonList, function(index, item){
            group = jsonList[index].group;
            if(!(group in groups))
                groups[group] = [];
            var option = {id: jsonList[index].id, name: jsonList[index].name};
            groups[group].push(option);
        });

        $.each(groups, function(groupName, item){
            optionsGroup.push({groupName: groupName, options: item});
            indexGroup++;
        });

        return optionsGroup;
    }