Codesignal Solution: Factorial

Original Problem

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