31 lines
605 B
Markdown
31 lines
605 B
Markdown
---
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title: Factorial of number
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type: snippet
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language: javascript
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tags: [math,algorithm,recursion]
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cover: flower-vase
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dateModified: 2020-12-28T13:49:24+02:00
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---
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Calculates the factorial of a number.
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- Use recursion.
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- If `n` is less than or equal to `1`, return `1`.
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- Otherwise, return the product of `n` and the factorial of `n - 1`.
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- Throw a `TypeError` if `n` is a negative number.
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```js
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const factorial = n =>
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n < 0
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? (() => {
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throw new TypeError('Negative numbers are not allowed!');
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})()
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: n <= 1
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? 1
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: n * factorial(n - 1);
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```
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```js
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factorial(6); // 720
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```
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