--- title: Boo Who ---   Remember to use <a>**`Read-Search-Ask`**</a> 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 * <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean' target='_blank' rel='nofollow'>Boolean</a> ##  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: ```javascript function booWho(bool) { return typeof bool === 'boolean'; } // test here booWho(null); ```  <a href='https://repl.it/CLnK/0' target='_blank' rel='nofollow'>Run Code</a> # 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 * <a>Using typeof</a> * <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof' target='_blank' rel='nofollow'>typeof</a> ##  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**.  * Please add your username only if you have added any **relevant main contents**. ( **_DO NOT_** _remove any existing usernames_) > See  <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.