function generateRandomString(length) {

const characters = [];

const characterSet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';

for (let i = 0; i < length; i++) {

characters.push(characterSet.charAt(generateRandomNumber(0, characterSet.length)));

}

return characters.join('');

}

function generateRandomNumber(min, max) {

return Math.floor(Math.random() * (max - min + 1)) + min;

}

console.log(generateRandomString(16));

console.log(Math.PI);

function circleArea(radius) {

return Math.pow(radius, 2) * Math.PI;

}

const now = new Date();

console.log(now);

const past = new Date('August 31, 2007 00:00:00');

console.log(past);

console.log(past.getFullYear());

console.log(past.getMonth());

console.log(past.getDate());

console.log(past.toString());

console.log(Math.floor(Date.now() / 1000));