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Factorial

Let us practice the for loop with the factorial used in mathematics. The factorial of a positive integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example, 3! = 1*2*3 = 6. By definition, 0! = 1.

Exercise

Write a function factorial that calculates the factorial of a positive integer. factorial(3) should return 6.
var factorial = function(n) {
      var result = 1;
      for (...) {
        ...
      }
      return result;
    };
var factorial = function(n) {
  var result = 1;
  for (var i = 1; i <= n; i++) {
    result = result * i;
  }
  return result;
};