Flatten an Object

flatten.js

const flatten = require("flat");

const dogs = {
  dog1: {
    name: "Bailey",
    breed: "Lab",
    age: 3,
    best_friend: {
      name: "Vinny",
      breed: "Golden Retriever",
      age: 3
    }
  },
  dog2: {
    name: "Vinny",
    breed: "Golden Retriever",
    age: 3,
    best_friend: {
      name: "Bailey",
      breed: "Lab",
      age: 3
    }
  }
};

const flatten1 = obj => {
  let newObj = {};
  for (let i in obj) {
    if (typeof obj[i] === "object") {
      let flat = flatten1(obj[i]);
      for (let j in flat) {
        newObj[i + "." + j] = flat[j];
      }
    } else {
      newObj[i] = obj[i];
    }
  }
  return newObj;
};

const flatten2 = obj => flatten(obj);

console.log("Flatten with vanilla JS:\n", flatten1(dogs));
console.log("===============================================");
console.log("Flatten with flat package:\n", flatten2(dogs));