Array Of Class Objects

A class may have a property that is array and contains class instances.

Example

class Car {
    constructor(model, price) {
        this.model = model;
        this.price = price;
    }

printData() {
        console.log("Model: " + this.model);
        console.log("Price: " + this.price);
    }
}

class CarDealership {
    constructor() {
        this.cars = [];
    }

sortByPrice() {
        // sort cars by price:
        this.cars.sort(function (a, b) {
            if(a.price < b.price) {
                return -1;
            }
            else if (a.price === b.price) {
                return 0;
            }

return 1;
        });
    }

listCarsData() {
        this.cars.forEach(function(car) {
            console.log("--------");
            car.printData();
        });
    }
}

carDealership = new CarDealership();

car_1 = new Car("Ford Fiesta", 20000);
car_2 = new Car("Toyota Corolla", 26000);
car_3 = new Car("Renault Clio", 18000);

carDealership.cars = [];

// Add elements to the array:
carDealership.cars.push(car_1);
carDealership.cars.push(car_2);
carDealership.cars.push(car_3);

console.log("Before Sorting:");
console.log('');

carDealership.listCarsData();

carDealership.sortByPrice();
console.log('');
console.log("After Sorting:");
console.log('');

carDealership.listCarsData();

Output:

Explanation:

At line 15 an empty array is created.
At lines 49 - 51 elements are added to the array.
At lines 20 - 29 the array is sorted ascending by price. If at line 21 the sign < is replaced with >, then the sorting would be descending.