HackerRank - Right Aligned Triangle (JS)

main.js

//https://www.hackerrank.com/challenges/staircase/problem
'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.replace(/\s*$/, '')
        .split('\n')
        .map(str => str.replace(/\s*$/, ''));

    main();
});

function readLine() {
    return inputString[currentLine++];
}

// Complete the staircase function below.
function staircase(n) {
    let staircase = "";
    for(let r=0;r<n;r++){
        for(let c = 0; c<n; c++){
            if(c<(n-1)-r){
                staircase += " ";
            } else{
                staircase += "#";
            }
        }
        staircase += "\n";
    }
    
    console.log(staircase);
}

function main() {
    const n = parseInt(readLine(), 10);

    staircase(n);
}