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Exercise 1

This exercise re-examines exercise 2 from the previous chapter. In that exercise, you wrote an object factory to instantiate objects that represent smartphones. In this exercise, we'll rewrite that factory using a class.

Write a class that can be used to instantiate objects that represent smartphones. Each smartphone should have a brand, model, and release year. Add methods to check the battery level and to display the smartphone's information. Create objects that represent the following 2 smartphones:

Brand	Model	Release Year
Apple	iPhone 12	2020
Samsung	Galaxy S21	2021

Solution

class Smartphone {
  constructor(brand, model, releaseYear) {
    this.brand = brand;
    this.model = model;
    this.releaseYear = releaseYear;
  }

  checkBatteryLevel() {
    return `${this.brand} ${this.model} has 75% battery remaining.`;
  }

  displayInfo() {
    return `${this.releaseYear} ${this.brand} ${this.model}`;
  }
}

let iphone12 = new Smartphone('Apple', 'iPhone 12', 2020);
let galaxyS21 = new Smartphone('Samsung', 'Galaxy S21', 2021);

console.log(iphone12.checkBatteryLevel());
// Apple iPhone 12 has 75% battery remaining.

console.log(iphone12.displayInfo());
// 2020 Apple iPhone 12

console.log(galaxyS21.checkBatteryLevel());
// Samsung Galaxy S21 has 75% battery remaining.

console.log(galaxyS21.displayInfo());
// 2021 Samsung Galaxy S21

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