console.log(0xff, 0o17, 0b1010);

console.log(1_000_000 + 250_000);

console.log(9007199254740993n + 1n);

console.log(1e3, 2.5e-3);

console.log("Привет\u{1F44B}\tмир\n— \"цитата\"");

console.log(/блокнот/i.test("Новый БЛОКНОТ"));

const a = [1, , 3];
console.log(a.length, 1 in a);
a.forEach((x) => console.log(x));

function rub(strings, ...values) {
  return strings.reduce((out, s, i) => out + s + (i < values.length ? values[i] + " ₽" : ""), "");
}
console.log(rub`Блокнот ${220}, пенал ${290}`);
console.log(String.raw`C:\new\shelf`);

const size = "L";
const prices = { [size]: 290, [`${size}-promo`]: 250 };
console.log(prices);

const cart = {
  items: [220, 150],
  total() { return this.items.reduce((a, b) => a + b, 0); }
};
console.log(cart.total());

const cup = {
  ml: 350,
  get liters() { return this.ml / 1000; },
  set liters(v) { this.ml = v * 1000; }
};
cup.liters = 0.45;
console.log(cup.ml, cup.liters);