const obj = {};
let value = 0;

Object.defineProperty(obj, 'prop', {
  get() {
    return value;
  },
  set(newValue) {
    value = newValue + 1;
  },
  configurable: true,
  enumerable: true
});

obj.prop = 10;
console.log(obj.prop);

class Parent {
  static greet() {
    return 'Hello from Parent';
  }
}

class Child extends Parent {
  static greet() {
    return super.greet() + ' and Child';
  }
}

const childInstance = new Child();
console.log(childInstance.greet);

const array = [1, 2, 3, 4, 5];
const result = array.splice(2, 2, 6, 7);

console.log(array, result);

const obj1 = { a: 1 };
const obj2 = Object.create(obj1);
obj2.b = 2;

const result = Object.entries(obj2).map(([key, value]) => key + value);

console.log(result);

const array = [1, 2, 3, 4, 5];
const result = array.find(n => n > 3) ? array.every(n => n < 6) : array.some(n => n > 4);

console.log(result);

function* generator() {
  yield 'a';
  yield* 'bcd';
  yield 'e';
}

const gen = generator();
console.log([...gen]);

const array = [1, 2, [3, 4, [5, 6]]];
const result = array.flat(2).map(n => n * 2);

console.log(result);