# Day 1: Functions | 10 Days Of JavaScript | HackerRank Solution

Hello coders, today we are going to solve Day 1: Functions HackerRank Solution which is a part of 10 Days of JavaScript Series.

Contents

## Objective

Today, we’re discussing JavaScript functions. Check out the attached tutorial for more details.

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

## Input Format

Locked stub code in the editor reads a single integer, n, from stdin and passes it to a function named factorial.

• 1 <= n <= 10

## Output Format

The function must return the value of n!.

Sample Input 0

``4``

Sample Output 0

``24``

Explanation 0

We return the value of  4! = 4 x 3 x 2 x 1 = 24.

## Solution – Day 1: Functions

```'use strict';

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', inputStdin => {
inputString += inputStdin;
});

process.stdin.on('end', _ => {
inputString = inputString.trim().split('\n').map(string => {
return string.trim();
});

main();
});

return inputString[currentLine++];
}
/*
* Create the function factorial here
*/
function factorial(n) {
if (n < 2){
return 1;
}
return n * factorial(n-1);
}

function main() {
const n = +(readLine());

console.log(factorial(n));
}```

Disclaimer: The above Problem (Functions) is generated by Hacker Rank but the Solution is provided by CodingBroz. This tutorial is only for Educational and Learning Purpose.