StaireCase.js

'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 pat = new Array(n+1).fill(' ')
    for (let i=n-1; i>=0; i--){
        pat[i]="#";
        console.log(pat.join(''));
    }
}


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

    staircase(n);
}