class FirstClass {

constructor(firstField) {

this.firstField = firstField;

}

someFunc() {

console.log(`Some text here: ${this.firstField}`);

}

}

const firstObject = new FirstClass("12345");

console.log(firstObject.someFunc());

const secondObject = Reflect.construct(FirstClass, ["54321"]);

console.log(secondObject.someFunc());

class SecondClass {

secondField = "Another text here";

}

const thirdObject = Reflect.construct(FirstClass, ["123"], SecondClass);

console.log(thirdObject.__proto__ === FirstClass.prototype);

console.log(thirdObject.__proto__ === SecondClass.prototype);

Reflect.apply(secondObject.someFunc, { firstField: "000"}, []);

console.log(Reflect.ownKeys(secondObject));

Reflect.preventExtensions(secondObject);

secondObject.newField = "Demo";

console.log(Reflect.isExtensible(secondObject));

console.log(secondObject);