JS10 Day 1: Functions

개요

Day 1: Functions

• https://www.hackerrank.com/challenges/js10-function/problem
• 참고: 자바스크립트 factorial()

해커랭크 10 Days of Javascript

#	문제	비고
0-1 Day e
1	JS10 Day 0: Hello, World!
2	JS10 Day 0: Data Types
3	JS10 Day 1: Arithmetic Operators
4	JS10 Day 1: Functions
5	JS10 Day 1: Let and Const

---

'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++];
}

function factorial(n) {
    var result = 1;
    for(var i=2; i<=n; i++) {
        result *= i;
    }
    return result;
}

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