Group by/order by On JSON data using javascript/jquery

Question

I have a JSON data and I need to do something like group by and i asked this question before here but i am not getting any satisfied answer so this time i would like to expl

Answer 1

Use first class functions to create generic group by key reducers and a sorters. I will take the reducer from a previous answer of mine. That way you can sort and group by any key you like, in a similar way that you would do in SQL.

const groupBy = key => (result,current) => {
  const item = Object.assign({},current);
  if (typeof result[current[key]] == 'undefined'){
    result[current[key]] = [item];
  }else{
    result[current[key]].push(item);
  }
  return result;
};

const stringSortBy = key => (a,b) => {
   const sa = a[key];
   const sb = b[key];
   return sa < sb ? -1 : +(sa > sb);
};

const myObject = {
    "Apps": [
        {
            "Name": "app1",
            "id": "1",
            "groups": [
                {
                    "id": "1",
                    "name": "test group 1",
                    "category": "clinical note",
                    "author": "RRP"
                }, {
                    "id": "2",
                    "name": "test group 2",
                    "category": "clinical image",
                    "author": "LKP"
                }, {
                    "id": "3",
                    "name": "test group 3",
                    "category": "clinical document",
                    "author": "RRP"
                }, {
                    "id": "4",
                    "name": "test group 4",
                    "category": "clinical note",
                    "author": "John"
                }
            ]
        }
    ]
}

const categories = myObject.Apps[0].groups.reduce(groupBy('category'),{});
console.log(categories);
const sorted = myObject.Apps[0].groups.sort(stringSortBy('author'));
console.log(sorted);