Inheritance in Classes

Com a keyword extends definimos qual vai ser a classe que vai ser a pai para herdarmos:

class TaxedProduct extends Product {

Com o keyword super() fazemos o uso do construtor da classe que estamos herdando:

constructor(name, price, taxRate = 1.2) {
    super(name, price);
    this.taxRate = taxRate;
}

Exemplo:

class Product {
    constructor(name, price) {
        this.name = name;
        this.price = price;
    }

    toString() {
        return `toString: Name: ${this.name}, Price: ${this.price}`;
    }
}

class TaxedProduct extends Product {
    constructor(name, price, taxRate = 1.2) {
        super(name, price);
        this.taxRate = taxRate;
    }

    getPriceIncTax() {
        return Number(this.price) * this.taxRate;
    }

    toString() {
        let chainResult = super.toString();
        return `${chainResult}, Tax: ${this.getPriceIncTax()}`;
    }
}

let hat = new TaxedProduct("Hat", 100);
let boots = new TaxedProduct("Boots", 100, 1.3);

console.log(hat.toString());
console.log(boots.toString());

05 November 2025