Formatando valores para string

locale.js

const num = 15236.639;
console.log(num.toLoacaleString('pt-BR'));
// "15.236,639"
console.log(new Intl.NumberFormat('pt-BR', { style: 'currency', currency: 'BRL' }).format(num));
// "R$15.236,64"

const now = new Date();
console.log(now.toLocaleString('pt-BR'));

// Function to generate a radom string with defined length
function randomString(length) {
    let result = '';
    const chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    for (let i = length; i > 0; --i)
      result += chars[Math.round(Math.random() * (chars.length - 1))];

    return result;
}