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

title
Falsy Bouncer

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

Problem Explanation:

Remove all falsy values from an array.

Relevant Links

• Falsy Values

Hint: 1

Falsy is something which evaluates to FALSE. There are only six falsy values in JavaScript: undefined, null, NaN, 0, "" (empty string), and false of course.

try to solve the problem now

Hint: 2

We need to make sure we have all the falsy values to compare, we can know it, maybe with a function with all the falsy values...

try to solve the problem now

Hint: 3

Then we need to add a filter() with the falsy values function...

try to solve the problem now

Spoiler Alert!

Solution ahead!

Advanced Code Solution:

function bouncer(arr) {
  return arr.filter(Boolean);
}

Run Code

Code Explanation:

The Array.prototype.filter method expects a function that returns a Boolean value which takes a single argument and returns true for truthy value or false for falsy value. Hence we pass the built-in Boolean function.

Relevant Links

• Boolean
• Truthy
• Array.prototype.filter()

Credits:

If you found this page useful, you can give thanks by copying and pasting this on the main chat:

Thanks @renelis @abhisekp @Rafase282 for your help with Algorithm: Falsy Bouncer

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 Wiki Challenge Solution Template for reference.