HackerRank Day 1: Functions problem solution

Day 1: Functions | 10 Days Of JavaScript | HackerRank Solution: Hey Coders, In this Post we are solving Day 1: Functions HackerRank Solution which is a part of 10 Days of JavaScript Series.

 

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.

Solution – Day 1: Functions | 10 Days of JavaScript | HackerRank Solution

 

'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 < 2){
        return 1;
    }
    return n * factorial(n-1);
}
function main() {
    const n = +(readLine());
    console.log(factorial(n));
}

 

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