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add another way to calculate factorial #22

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Dec 12, 2017
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add another way to calculate factorial #22

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8 changes: 7 additions & 1 deletion snippets/factorial.md
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### Factorial

Create an array of length `n+1`, use `reduce()` to get the product of every value in the given range, utilizing the index of each element.
Use recursion. If `n` is less than (for safety) or equal to `1`, return `1`. Otherwise, return the product of `n` and the factorial of `n - 1`.

```js
const factorial = n => n <= 1 ? 1 : n * factorial(n - 1)
```

Another way: create an array of length `n+1`, use `reduce()` to get the product of every value in the given range, utilizing the index of each element.

```js
var factorial = n =>
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