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Exercise 2

This exercise re-examines exercise 4 from the previous chapter. In that exercise, you wrote a constructor function to instantiate smartphone objects. In this exercise, we'll rewrite that constructor as an object factory.

Write a factory function that creates 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 smartphones's information. 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) {
  return {
    brand,
    model,
    releaseYear,

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

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

let iphone12 = smartPhone('Apple', 'iPhone 12', 2020);
let galaxyS21 = 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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