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Exercise 6

Reimplement the factorial function from exercise 2 using recursion. Once again, you may assume that the argument is always a positive integer.

Examples

console.log(factorial(1));     // => 1
console.log(factorial(2));     // => 2
console.log(factorial(3));     // => 6
console.log(factorial(4));     // => 24
console.log(factorial(5));     // => 120
console.log(factorial(6));     // => 720
console.log(factorial(7));     // => 5040
console.log(factorial(8));     // => 40320

Solution

function factorial(number) {
  if (number === 1) {
    return 1;
  }

  return number * factorial(number - 1);
}

console.log(factorial(1));     // => 1
console.log(factorial(2));     // => 2
console.log(factorial(3));     // => 6
console.log(factorial(4));     // => 24
console.log(factorial(5));     // => 120
console.log(factorial(6));     // => 720
console.log(factorial(7));     // => 5040
console.log(factorial(8));     // => 40320

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