HOMEWORK: https://github.com/HackYourFuture-CPH/JavaScript/blob/main/javascript3/week3/homework.md

Classes

— Key concepts

• Object-Oriented-Programming (OOP); principles:

  • Abstraction – making things re-usable
  • Encapsulation – hiding complex details
  • Inheritance – adapting re-usable things
  • Polymorphism – creating multiple variants of a thing

• Constructor: creates an instance of the class

• Built-in classes: Date, String, Promise, ...

• Classes can be extended (base or super class, sub class)

  • If you need to modify the constructor, you need to call super() to call the constructor of the parent class as the very first thing

• Static fields and methods can be used without instantiation

• All fields and methods are public by default (don’t worry too much about it for now)

• Resources & exercises

this

— Key concepts

• Refers to the instance of the class

• Can’t be used in static methods

• Bonus: bind + this

  • Example: .catch(console.log.bind(console))
  • Allows you to set this to a specific value in a new scope that would otherwise not have access to the value

• Resources & exercises