freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/es6/use-getters-and-setters-to-control-access-to-an-object/index.md

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Use getters and setters to Control Access to an Object

Use getters and setters to Control Access to an Object

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.

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.

Spoiler Alert - Solution Ahead!

Solution

function makeClass() {
  "use strict";
  /* Alter code below this line */
  
  class Thermostat {
    constructor(fahrenheit) {
      this.fahrenheit = fahrenheit;
    }
    get temperature() {
      return 5 / 9 * (this.fahrenheit - 32);
    }
    set temperature(celsius) {
      this.fahrenheit = celsius * 9.0 / 5 + 32;
    }
  }
  
  /* Alter code above this line */
  return Thermostat;
}