class Pencil {
constructor(color) {
this.color = color;
}
intro() {
console.log(`this is ${this.color} pencil`);
}
};
class SomePencil extends Pencil {
constructor(color, type) {
super(color);
this.type = type;
}
};
class AnotherPencil extends SomePencil {
constructor(color,) {
super(color);
}
};
let pen1 = new Pencil();
let pen2 = new SomePencil("red", "common");
let pen3 = new AnotherPencil("green");
console.log("type" in pen3); // trueclass AnotherPencil extends SomePencil {
constructor(color, type) {
super(color, type);
}
};