freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/boo-who/index.md

title

title
Boo Who

Remember to use Read-Search-Ask if you get stuck. Try to pair program and write your own code

Problem Explanation:

This program is very simple, the trick is to understand what a boolean primitive is. The programs requires a true or false answer.

Relevant Links

• Boolean

Hint: 1

• You will need to check for the type of the parameter to see if it is a boolean.

try to solve the problem now

Hint: 2

• To check for the type of a parameter, you can use typeof.

try to solve the problem now

Hint: 3

• Since you must return true or false you can use if statements or just have it return the boolean used for the if statement.

try to solve the problem now

Spoiler Alert!

Solution ahead!

Basic Code Solution:

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

    // test here
    booWho(null);

Run Code

Code Explanation:

Uses the operator typeof to check if the variable is a boolean. If it is, it will return true. Otherwise, if it is any other type it will return false.

Relevant Links

• Using typeof
• typeof

NOTES FOR CONTRIBUTIONS:

• DO NOT add solutions that are similar to any existing solutions. If you think it is similar but better, then try to merge (or replace) the existing similar solution.
• Add an explanation of your solution.
• Categorize the solution in one of the following categories — Basic, Intermediate and Advanced.