freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-javascript/6a0dcc730cb92a616f86f0c3.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
6a0dcc730cb92a616f86f0c3	Challenge 299: Schema Validator Part 5	28	challenge-299

--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,
  badges: string[]
}

• 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.
• The brackets [] after string means that badges should be an array of strings (or empty).
• Extra keys are allowed

--hints--

isValidSchema({ username: "gill", posts: 12, verified: false, role: "creator", supporter: false, badges: [ "early-adopter", "popular" ] }) should return true.

assert.isTrue(isValidSchema({ username: "gill", posts: 12, verified: false, role: "creator", supporter: false, badges: [ "early-adopter", "popular" ] }));

isValidSchema({ username: "tonya", posts: 299, verified: true, role: "moderator", supporter: true, badges: [ "streak-master", "veteran" ], followers: 1233 }) should return true.

assert.isTrue(isValidSchema({ username: "tonya", posts: 299, verified: true, role: "moderator", supporter: true, badges: [ "streak-master", "veteran" ], followers: 1233 }));

isValidSchema({ username: "zara", posts: 0, verified: false, role: "user", supporter: false, badges: [] }) should return true.

assert.isTrue(isValidSchema({ username: "zara", posts: 0, verified: false, role: "user", supporter: false, badges: [] }));

isValidSchema({ username: "nicole", posts: 65, verified: true, role: "admin", supporter: false, badges: [ "first-post", 18 ] }) should return false.

assert.isFalse(isValidSchema({ username: "nicole", posts: 65, verified: true, role: "admin", supporter: false, badges: [ "first-post", 18 ] }));

isValidSchema({ username: "tim", posts: 25, verified: true, role: "staff", supporter: false }) should return false.

assert.isFalse(isValidSchema({ username: "tim", posts: 25, verified: true, role: "staff", supporter: false }));

isValidSchema({ username: "charlie", posts: 0, verified: false, role: "user", supporter: "no", badges: [ "first-post", "anniversary" ] }) should return false.

assert.isFalse(isValidSchema({ username: "charlie", posts: 0, verified: false, role: "user", supporter: "no", badges: [ "first-post", "anniversary" ] }));

isValidSchema({ username: "wanda", posts: 15, verified: true, role: "friend", supporter: true, badges: [ "popular" ] }) should return false.

assert.isFalse(isValidSchema({ username: "wanda", posts: 15, verified: true, role: "friend", supporter: true, badges: [ "popular" ] }));

isValidSchema({ username: "guy", posts: 5, verified: "false", role: "staff", supporter: true, badges: [ "helper" ] }) should return false.

assert.isFalse(isValidSchema({ username: "guy", posts: 5, verified: "false", role: "staff", supporter: true, badges: [ "helper" ] }));

isValidSchema({ username: "carrie", verified: true, role: "moderator", supporter: true, badges: [ "helper", "sharer" ] }) should return false.

assert.isFalse(isValidSchema({ username: "carrie", verified: true, role: "moderator", supporter: true, badges: [ "helper", "sharer" ] }));

isValidSchema({ username: true, posts: 75, verified: true, role: "creator", supporter: true, badges: [ "veteran" ] }) should return false.

assert.isFalse(isValidSchema({ username: true, posts: 75, verified: true, role: "creator", supporter: true, badges: [ "veteran" ] }));

--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') &&
    Array.isArray(obj.badges) && obj.badges.every(b => typeof b === 'string')
  );
}