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Exercise 1

This exercise re-examines exercise 1 from the previous chapter. In that exercise, you wrote a class to instantiate smartphone objects. In this exercise, we'll rewrite that solution using the constructor/prototype pattern.

Using the constructor/prototype pattern, create a type that represents smartphones. Each smartphone should have a brand, model, and release year. Add methods that display the smartphone's information and check its battery level. Create objects that represent the following two smartphones:

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

Solution

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

Smartphone.prototype.checkBatteryLevel = function() {
  return `${this.brand} ${this.model} has 75% ` +
         'battery remaining.';
};

Smartphone.prototype.displayInfo = function() {
  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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