Array of objects convert to objects sorted by index (Javascript)

Question

I have this array:

const list = [{id: 5}, {id: 1}, {id: 4}];

i want to achieve this:

const result = { 5: {id:5}, 1: {id: 1}, 4: {id: 4}};

I tried with reduce, object assign, and it always sorts by id for example:

const listById = list => {
 return list.reduce((acc, cur) => {
  const { id } = cur;
  return {
   ...acc,
   [id]: cur,
 };
}, {});

};

This sorts by id:

{ 1: {id: 1}, 4: {id:4}, 5: {id:5}}

but I don't want that.