factorial.js

//return the factorial of a number

function factorial(number) {
  if (number <= 1) {
    return 1;
  } else {
    return number * factorial(number - 1);
  }
}

console.log(factorial(1)); //1
console.log(factorial(2)); //2
console.log(factorial(4)); //24
console.log(factorial(7)); //5040