reduce-02.js

const list = [
  { 
    id: "772b70fa-57be-40fc-976a-1123320df94e",
    name: "Jupiter"
  },
  { 
    id: "cced1a50-19b7-4971-aacc-a732eb5ec64c",
    name: "Saturn"
  },
  { 
    id: "b5d958de-d470-430d-a734-eaf8b6a716bb",
    name: "Oberon"
  },
  { 
    id: "322371bb-00fb-4cf8-8428-ca9fa342d98c",
    name: "Miranda"
  },
  { 
    id: "84ae49b6-3f2a-4db1-9b06-9d1c3ebc57a8",
    name: "Titania"
  }
];

const result = list.reduce((accumulator, item) => {
  accumulator[item.id] = item;
  return accumulator;
}, {});

console.log(result);

{ 
  "772b70fa-57be-40fc-976a-1123320df94e": {
    id: "772b70fa-57be-40fc-976a-1123320df94e",
    name: "Jupiter"
  },
  "cced1a50-19b7-4971-aacc-a732eb5ec64c": { 
    id: "cced1a50-19b7-4971-aacc-a732eb5ec64c",
    name: "Saturn"
  },
  "b5d958de-d470-430d-a734-eaf8b6a716bb": {
    id: "b5d958de-d470-430d-a734-eaf8b6a716bb",
    name: "Oberon"
  },
  "322371bb-00fb-4cf8-8428-ca9fa342d98c": {
    id: "322371bb-00fb-4cf8-8428-ca9fa342d98c",
    name: "Miranda"
  },
  "84ae49b6-3f2a-4db1-9b06-9d1c3ebc57a8": {
    id: "84ae49b6-3f2a-4db1-9b06-9d1c3ebc57a8",
    name: "Titania"
  }
};