In this **HackerRank Day 1: Functions 10 days of javascript problem solution** Implement a function named factorial that has one parameter: an integer, n. It must return the value of n! (i.e., n factorial).

## Problem solution in JavaScript programming.

/*
* Create the function factorial here
*/
function factorial(n) {
var factor =1;
for(var i=1; i<=n; i++)
factor = factor * i;
return factor;
}