freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-data-structures/generate-an-array-of-all-object-keys-with-object.keys.english.md

id, title, challengeType, forumTopicId

id	title	challengeType	forumTopicId
587d7b7d367417b2b2512b1e	Generate an Array of All Object Keys with Object.keys()	1	301160

Description

We can also generate an array which contains all the keys stored in an object using the Object.keys() method and passing in an object as the argument. This will return an array with strings representing each property in the object. Again, there will be no specific order to the entries in the array.

Instructions

Finish writing the getArrayOfUsers function so that it returns an array containing all the properties in the object it receives as an argument.

Tests

tests:
  - text: The <code>users</code> object should only contain the keys <code>Alan</code>, <code>Jeff</code>, <code>Sarah</code>, and <code>Ryan</code>
    testString: assert('Alan' in users && 'Jeff' in users && 'Sarah' in users && 'Ryan' in users && Object.keys(users).length === 4);
  - text: The <code>getArrayOfUsers</code> function should return an array which contains all the keys in the <code>users</code> object
    testString: assert((function() { users.Sam = {}; users.Lewis = {}; let R = getArrayOfUsers(users); return (R.indexOf('Alan') !== -1 && R.indexOf('Jeff') !== -1 && R.indexOf('Sarah') !== -1 && R.indexOf('Ryan') !== -1 && R.indexOf('Sam') !== -1 && R.indexOf('Lewis') !== -1); })() === true);

Challenge Seed

let users = {
  Alan: {
    age: 27,
    online: false
  },
  Jeff: {
    age: 32,
    online: true
  },
  Sarah: {
    age: 48,
    online: false
  },
  Ryan: {
    age: 19,
    online: true
  }
};

function getArrayOfUsers(obj) {
  // Only change code below this line

  // Only change code above this line
}

console.log(getArrayOfUsers(users));

Solution

let users = {
  Alan: {
    age: 27,
    online: false
  },
  Jeff: {
    age: 32,
    online: true
  },
  Sarah: {
    age: 48,
    online: false
  },
  Ryan: {
    age: 19,
    online: true
  }
};

function getArrayOfUsers(obj) {
  return Object.keys(obj);
}

console.log(getArrayOfUsers(users));