# Codesignal: Factorial

Given integer `n`

, find n!.

**Example**

For `n = 5`

, the output should be`factorial(n) = 120`

.

Here `1 * 2 * 3 * 4 * 5 = 120`

.

**Input/Output**

**[time limit] 4000ms (js)**

**[input] integer n***Constraints:*`0 ≤ n ≤ 10`

.**[output] integer**

**Solution**

_ = factorial = n => n ? n * _(n - 1) : 1