Day 1: Functions 10 days of javascript hackerRank solutions

In this Day 1: Functions 10 days of javascript hackerRank solutions you need to Implement a function named factorial that has one parameter: an integer, n. It must return the value of n!.

Objective

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

Task

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.

Constraints

• 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.

Day 1: Functions 10 days of javascript hackerRank solutions

'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();    
});

function readLine() {
    return inputString[currentLine++];
}
/*
 * Create the function factorial here
 */

function factorial(n){
    if(n === 0){
        return 1;
    } else{
        return n * factorial(n-1);
    }
}


function main() {
    const n = +(readLine());
    
    console.log(factorial(n));
}

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10 Days of javascript HackerRank solutions