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Boo who - JavaScript Solution & Walkthrough

(10/16) Learn how to solve coding challenges using FreeCodeCamp's curriculum.

Benjamin Semah
·Apr 10, 2022·

2 min read

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• 10/16 Boo who
• Understanding the Challenge
• Pseudocode
• Solving the Challenge
• Final Solution
• Congratulations!

10/16 Boo who

Check if a value is classified as a boolean primitive. Return `true` or `false`.

Boolean primitives are `true` and `false`.

``````function booWho(bool) {

return bool;
}

booWho(null);
``````

Credit: FreeCodeCamp.org

Understanding the Challenge

We are given a value `bool`. What we need to do to complete the function is to check whether the value is either `true` or `false`. If it is, then we return true. If it is not, then we return false.

This can be a bit tricky.

Note: If the value `bool` is true, the function should return true. And if the value `bool` is false, the function should return true. This is because `true` is a boolean primitive and `false` is also a boolean primitive.

Pseudocode

``````Given a value (bool)
Check whether it is true or false
if it is, return true
if not, return false
``````

Solving the Challenge

As always, there are a number of ways to go about this challenge. For this one, we will use the tenary operator.

The tenary operator works like this

``````condition ? code to execute if true : code to execute if false
``````

First, you state a condition, followed by the question mark `?`, then you state the code to be run or returned if the condition is met. This is followed by the `:` and then you state the code to be run or returned if the condition is not met.

So in the case of this challenge, using the tenary operator will look like this

``````(bool === true || bool === false) ? true : false;
``````

First we check if the provided value `bool` is true or false. If it is, we return `true`. if not, we return `false`.

Our function is now complete!

Final Solution

``````function booWho(bool) {
return (bool === true || bool === false) ? true : false;
}

booWho(null); // false
``````

Congratulations!

You just cracked the ninth challenge in this series.

Cheers and happy coding!

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