Class Syntax

We use the class construct to define a type and create encapsulation.

class Note {
  constructor(content) {
    this.text = content;
  }

  print() {
    console.log(this.text);
  }
}

• A class is declared using the class keyword.
• By convention, the class name is capitalized.
• A class has a unique constructor method that is named constructor.
• Think of the constructor the same way you thought of them in Java/C++. That is, use them to initialize the state (attributes) of your objects.
• In JavaScript, unlike Java/C++, a class can only have one constructor.
• Methods can be declared using a syntax that resembles methods in Java/C++.
• Inside a class declaration, unlike in object literal, method definitions are not separated by a comma.
• Aside: Classes are not hoisted.

A class encapsulates state (data) and behavior (operations). In the example of Note, the data is a string of text stored in a this.text member property. The behavior is print(), a method that dumps the text to the console.