# 10 days Javascript: Functions

# Day 1: Functions

Solution for:

https://www.hackerrank.com/challenges/js10-hello-world/problem

## Task

Implement a function named factorial that has one parameter: an integer, n. It must return the value of n! (i.e., n factorial).

```
/*
* Create the function factorial here
*/
function factorial(n) {
var sum = 1;
for (var i = n; i > 1; i--) {
sum = sum * i;
}
return sum;
}
```