function example(a, b = a) {
  console.log(a + b);
}

example(2);
example(2, 3);

let foo = { n: 1 };
let bar = foo;
bar.n = 2;

console.log(foo.n);

console.log("5" - 1);
console.log("5" + 1);
console.log("5" * 2);
console.log("5" / "2");
console.log("five" * 2);

let x = {
  value: 10,
  toString() {
    return this.value++;
  },
};

if (x == 10 && x == 11) {
  console.log("It works!");
}

function test() {
  console.log(a);
  var a = 10;
  console.log(a);
}

test();

let arr = [1, 2, 3];
arr[10] = 42;

console.log(arr.length);
console.log(arr[6]);

let person = {
  name: "Alice",
  greet: () => {
    console.log(`Hello, ${this.name}`);
  },
};

person.greet();

let x = 1;

function outer() {
  let x = 2;

  function inner() {
    console.log(x);
  }

  return inner;
}

const func = outer();
func();

console.log(1);
setTimeout(() => console.log(2), 0);
Promise.resolve().then(() => console.log(3));
console.log(4);