FreeCodeCamp: Fractorilize a Number

Return the factorial of the provided integer.

If the integer is represented with the letter n, a factorial is the product of all positive integers less than or equal to n.

Factorials are often represented with the shorthand notation n!

For example: 5! = 1 * 2 * 3 * 4 * 5 = 120

Remember to use Read-Search-Ask if you get stuck. Write your own code.

Here are some helpful links:

• Arithmetic Operators

Starting Code:

function factorialize(num) {
  return num;
}

factorialize(5);

Use Cases:

factorialize(5) should return a number.
factorialize(5) should return 120.
factorialize(10) should return 3628800.
factorialize(20) should return 2432902008176640000.
factorialize(0) should return 1.

Solution:

function factorialize(num) {
  var sum = 1;
  for (var i=1; i <= num; i++) {
    sum *= i;
  }
  return sum;
}

factorialize(5);