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

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.

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Hint: 2

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

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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.

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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

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