spread-operator.js

const reactDevelopers = {
  yamanKatby: {
    fullName: "Yaman KATBY",
    userName: "@yamankatby"
  },
  ahmetKaya: {
    fullName: "Ahemt KAYA",
    userName: "@ahmetkaya"
  }
};

const reactNativeDevelopers = {
  zeynepBuse: {
    fullName: "Zeynep BUSE",
    userName: "@zeynepbuse"
  }
};

const allDevelopers = { ...reactDevelopers, ...reactNativeDevelopers };