freeCodeCamp Challenge Guide: Use getters and setters to Control Access to an Object

Guide
1

Use getters and setters to Control Access to an Object

Problem Explanation

Getters and setters are critical parts of a class/object. They allow you to control their attributes from the outside. They will become more prominent when you get started with the Object-Oriented Programming unit (coming up!). For now, this exercise shows you how to manipulate them with ES6.

Hints

Hint 1

Create the class, Thermostat. You’re going to put your constructor, getter, and setter in here.

Hint 2

Give the constructor a parameter (which you can name anything you want). Set the parameter to an attribute of the same name. Remember, you are initially setting things in Fahrenheit temperature.

Hint 3

Create a get method that converts the Fahrenheit attribute to Celsius. Use the formula given to you.

Hint 4:

Create a set method of the same name as the get method. It should have a parameter that accepts celsius temperature. Convert it to fahrenheit, and set it to the attribute.

Solutions

Solution 1 (Click to Show/Hide) 
class Thermostat {
  constructor(fahrenheit) {
    this._fahrenheit = fahrenheit;
  }
  
  get temperature() {
    return (5 / 9) * (this._fahrenheit - 32);
  }
  
  set temperature(celsius) {
    return this._fahrenheit = (celsius * 9.0) / 5 + 32;
  }
}
Solution 2 (Click to Show/Hide) 
class Thermostat {
  constructor(fahrenheit) {
    this._celsius = (5 / 9) * (fahrenheit - 32);
  }
  
  get temperature() {
    return this._celsius;
  }
  
  set temperature(celsius) {
    return this._celsius = celsius;
  }
}
Solution 3 (Click to Show/Hide) 
class Thermostat {
  constructor(fahrenheit) {
    this._kelvin = (5 / 9) * (fahrenheit - 32) + 273.15;
  }
  
  get temperature() {
    return this._kelvin - 273.15;
  }
  
  set temperature(celsius) {
    return this._kelvin = celsius + 273.15;
  }
}
246 Likes