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

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Falsy Bouncer

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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.

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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...

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Hint: 3

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

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Spoiler Alert!

Solution ahead!

Advanced Code Solution:

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

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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:

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

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