---
id: a302f7aae1aa3152a5b413bc
title: Factorialize a Number
localeTitle: Factorializar un número
isRequired: true
challengeType: 5
---

## Description
<section id='description'> 
Devuelve el factorial del entero proporcionado. 
Si el entero se representa con la letra n, un factorial es el producto de todos los enteros positivos menores o iguales a n. 
factoriales a menudo se representan con la notación abreviada <code>n!</code> 
Por ejemplo: <code>5! = 1 * 2 * 3 * 4 * 5 = 120</code> 
Solo se proporcionarán a la función números enteros mayores o iguales a cero. 
Recuerda usar <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514" target="_blank">Read-Search-Ask</a> si te atascas. Escribe tu propio código. 
</section>

## Instructions
<section id='instructions'> 

</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>factorialize(5)</code> debe devolver un número.
    testString: 'assert(typeof factorialize(5) === "number", "<code>factorialize(5)</code> should return a number.");'
  - text: <code>factorialize(5)</code> debe devolver 120.
    testString: 'assert(factorialize(5) === 120, "<code>factorialize(5)</code> should return 120.");'
  - text: <code>factorialize(10)</code> debe devolver 3628800.
    testString: 'assert(factorialize(10) === 3628800, "<code>factorialize(10)</code> should return 3628800.");'
  - text: <code>factorialize(20)</code> debe devolver 2432902008176640000.
    testString: 'assert(factorialize(20) === 2432902008176640000, "<code>factorialize(20)</code> should return 2432902008176640000.");'
  - text: <code>factorialize(0)</code> debe devolver 1.
    testString: 'assert(factorialize(0) === 1, "<code>factorialize(0)</code> should return 1.");'

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
function factorialize(num) {
  return num;
}

factorialize(5);
```

</div>



</section>

## Solution
<section id='solution'>


```js
function factorialize(num) {
  return num < 1 ? 1 : num * factorialize(num - 1);
}

factorialize(5);

```

</section>