sort the objects in array that has same value to one object inside the same array

Question

I am making Fetch request that return array of objects as follow:

[
   {"id":11,"name":"test1","day":"MON","level":2},
   {"id":13,"name":"test2","day":"TUE","level":3},
   {"id":14,"name":"test1","day":"WED","level":4},
   {"id":15,"name":"test2","day":"FRI","level":5}
]

So, inside this array I have four objects each two have the same name, so I want the result to be like this:

 {
           "test1" : [
                       {"id":11,"name":"test1","day":"MON","level":2}, 
                       {"id":14,"name":"test1","day":"WED","level":4}
                    ],
           "test2" :[
                      {"id":13,"name":"test2","day":"TUE","level":3}, 
                      {"id":15,"name":"test2","day":"FRI","level":5}
                    ]
  }

Answer 1

you can use a reduce function

const arr = [
   {"id":11,"name":"test1","day":"MON","level":2},
   {"id":13,"name":"test2","day":"TUE","level":3},
   {"id":14,"name":"test1","day":"WED","level":4},
   {"id":15,"name":"test2","day":"FRI","level":5}
];

const result = arr.reduce((acc, cur) => {
    acc[cur.name] = acc[cur.name] || [];
  acc[cur.name].push(cur);
  return acc;
}, {})

console.log(result);
console.log(Object.values(result).flat());