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Exercise 2

Write a function that computes and returns the factorial of a number by using a for loop. The factorial of a positive integer n, signified by n!, is defined as the product of all integers between 1 and n, inclusive:

n! Expansion Result
1! 1 1
2! 1 * 2 2
3! 1 * 2 * 3 6
4! 1 * 2 * 3 * 4 24
5! 1 * 2 * 3 * 4 * 5 120

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) {
  let result = 1;
  for (let counter = number; counter > 0; counter -= 1) {
    result *= counter;
  }

  return result;
}

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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