freeCodeCamp/boo-who.english.md at 4b7ad8447b8abded35729b7acb22991b57d8e9dc

Oliver Eyton-Williams f1c9b08cf3 fix(curriculum): add isHidden: false to challenges

This includes certificates (where it does nothing), but does not
include any translations.

2020-05-25 16:25:19 +05:30

1.8 KiB

Raw Blame History

id, title, isRequired, challengeType, isHidden, forumTopicId

id	title	isRequired	challengeType	isHidden	forumTopicId
a77dbc43c33f39daa4429b4f	Boo who	true	5	false	16000

Description

Check if a value is classified as a boolean primitive. Return true or false. Boolean primitives are true and false.

Instructions

Tests

tests:
  - text: <code>booWho(true)</code> should return true.
    testString: assert.strictEqual(booWho(true), true);
  - text: <code>booWho(false)</code> should return true.
    testString: assert.strictEqual(booWho(false), true);
  - text: <code>booWho([1, 2, 3])</code> should return false.
    testString: assert.strictEqual(booWho([1, 2, 3]), false);
  - text: <code>booWho([].slice)</code> should return false.
    testString: assert.strictEqual(booWho([].slice), false);
  - text: '<code>booWho({ "a": 1 })</code> should return false.'
    testString: 'assert.strictEqual(booWho({ "a": 1 }), false);'
  - text: <code>booWho(1)</code> should return false.
    testString: assert.strictEqual(booWho(1), false);
  - text: <code>booWho(NaN)</code> should return false.
    testString: assert.strictEqual(booWho(NaN), false);
  - text: <code>booWho("a")</code> should return false.
    testString: assert.strictEqual(booWho("a"), false);
  - text: <code>booWho("true")</code> should return false.
    testString: assert.strictEqual(booWho("true"), false);
  - text: <code>booWho("false")</code> should return false.
    testString: assert.strictEqual(booWho("false"), false);

Challenge Seed

function booWho(bool) {
  return bool;
}

booWho(null);

Solution

function booWho(bool) {
  return typeof bool === "boolean";
}

booWho(null);

1.8 KiB Raw Blame History