freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-javascript/6a0dcc730cb92a616f86f0c2.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
6a0dcc730cb92a616f86f0c2	Challenge 298: Schema Validator Part 4	28	challenge-298

--description--

Given an object (JavaScript) or dictionary (Python), determine if it matches the following schema:

Roles = "user" | "creator" | "moderator" | "staff" | "admin"

{
  username: string,
  posts: number,
  verified: boolean,
  role: Roles,
  supporter?: boolean
}

• The pipe (|) symbol means "or". role must be one of the listed Roles values.
• The question mark (?) after supporter means that the field is optional, but is the specified type if it exists.
• Extra keys are allowed

--hints--

isValidSchema({ username: "vivian", posts: 1, verified: false, role: "user", supporter: true }) should return true.

assert.isTrue(isValidSchema({ username: "vivian", posts: 1, verified: false, role: "user", supporter: true }));

isValidSchema({ username: "rudolph", posts: 15, verified: true, role: "creator" }) should return true.

assert.isTrue(isValidSchema({ username: "rudolph", posts: 15, verified: true, role: "creator" }));

isValidSchema({ username: "hernandez", posts: 35, verified: true, role: "moderator", supporter: false, followers: 55 }) should return true.

assert.isTrue(isValidSchema({ username: "hernandez", posts: 35, verified: true, role: "moderator", supporter: false, followers: 55 }));

isValidSchema({ username: "julia", posts: 50, verified: true, role: "admin", supporter: "true" }) should return false.

assert.isFalse(isValidSchema({ username: "julia", posts: 50, verified: true, role: "admin", supporter: "true" }));

isValidSchema({ username: "bernard", posts: 0, verified: true, role: "friend", supporter: true }) should return false.

assert.isFalse(isValidSchema({ username: "bernard", posts: 0, verified: true, role: "friend", supporter: true }));

isValidSchema({ username: "felix", posts: 40, verified: "yes", role: "staff", supporter: false }) should return false.

assert.isFalse(isValidSchema({ username: "felix", posts: 40, verified: "yes", role: "staff", supporter: false }));

isValidSchema({ username: "jimmy", posts: true, verified: false, role: "creator", supporter: true }) should return false.

assert.isFalse(isValidSchema({ username: "jimmy", posts: true, verified: false, role: "creator", supporter: true }));

isValidSchema({ username: true, posts: 30, verified: true, role: "moderator", supporter: false }) should return false.

assert.isFalse(isValidSchema({ username: true, posts: 30, verified: true, role: "moderator", supporter: false }));

--seed--

--seed-contents--

function isValidSchema(obj) {

  return obj;
}

--solutions--

function isValidSchema(obj) {
  const roles = ["user", "creator", "moderator", "staff", "admin"];
  return (
    typeof obj.username === 'string' &&
    typeof obj.posts === 'number' &&
    typeof obj.verified === 'boolean' &&
    roles.includes(obj.role) &&
    (obj.supporter === undefined || typeof obj.supporter === 'boolean')
  );
}