freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-javascript/6a1d9f98e819ed70a0e994d9.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
6a1d9f98e819ed70a0e994d9	Challenge 327: Database Migration	28	challenge-327

--description--

Given two database objects, return the second object with any missing properties from the first filled in.

• Fields that already exist in the record should not be overwritten.

--hints--

migrateRecord({ username: "", posts: 0 }, { verified: true }) should return { username: "", posts: 0, verified: true }.

assert.deepEqual(migrateRecord({ username: "", posts: 0 }, { verified: true }), { username: "", posts: 0, verified: true });

migrateRecord({ username: "", posts: 0 }, { username: "camper", posts: 5 }) should return { username: "camper", posts: 5 }.

assert.deepEqual(migrateRecord({ username: "", posts: 0 }, { username: "camper", posts: 5 }), { username: "camper", posts: 5 });

migrateRecord({ username: "", posts: 0, verified: false }, { username: "camper" }) should return { username: "camper", posts: 0, verified: false }.

assert.deepEqual(migrateRecord({ username: "", posts: 0, verified: false }, { username: "camper" }), { username: "camper", posts: 0, verified: false });

migrateRecord({ username: "", posts: 0 }, { username: "camper", role: "admin" }) should return { username: "camper", role: "admin", posts: 0 }.

assert.deepEqual(migrateRecord({ username: "", posts: 0 }, { username: "camper", role: "admin" }), { username: "camper", role: "admin", posts: 0 });

migrateRecord({ username: "", email: "", posts: 0, verified: false, role: "user", banned: false }, { username: "camper", email: "camper@freecodecamp.org", role: "admin" }) should return { username: "camper", email: "camper@freecodecamp.org", role: "admin", posts: 0, verified: false, banned: false }.

assert.deepEqual(migrateRecord({ username: "", email: "", posts: 0, verified: false, role: "user", banned: false }, { username: "camper", email: "camper@freecodecamp.org", role: "admin" }), { username: "camper", email: "camper@freecodecamp.org", role: "admin", posts: 0, verified: false, banned: false });

--seed--

--seed-contents--

function migrateRecord(schema, record) {

  return schema;
}

--solutions--

function migrateRecord(schema, record) {
  return { ...schema, ...record };
}