68 lines
3.7 KiB
Markdown
68 lines
3.7 KiB
Markdown
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---
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title: Boo Who
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---
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 Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program  and write your own code 
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### Problem Explanation:
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This program is very simple, the trick is to understand what a boolean primitive is. The programs requires a true or false answer.
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#### Relevant Links
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* <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean' target='_blank' rel='nofollow'>Boolean</a>
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##  Hint: 1
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* You will need to check for the type of the parameter to see if it is a boolean.
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> _try to solve the problem now_
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##  Hint: 2
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* To check for the type of a parameter, you can use `typeof`.
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> _try to solve the problem now_
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##  Hint: 3
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* 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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> _try to solve the problem now_
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## Spoiler Alert!
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**Solution ahead!**
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##  Basic Code Solution:
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```javascript
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function booWho(bool) {
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return typeof bool === 'boolean';
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}
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// test here
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booWho(null);
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```
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 <a href='https://repl.it/CLnK/0' target='_blank' rel='nofollow'>Run Code</a>
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# Code Explanation:
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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`.
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#### Relevant Links
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* <a>Using typeof</a>
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* <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof' target='_blank' rel='nofollow'>typeof</a>
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##  NOTES FOR CONTRIBUTIONS:
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*  **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.
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* Add an explanation of your solution.
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* Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. 
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* Please add your username only if you have added any **relevant main contents**. ( **_DO NOT_** _remove any existing usernames_)
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> See  <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.
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