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Inheritance

A class can inherit methods and properties from a parent class using the extends keyword:

class Titan {
  constructor(name) {
    this.name = name;
  }
}

class BeastTitan extends Titan {
  speak(msg) {
    console.log(`${this.name} says, "${msg}"`);
  }
}

const beast = new BeastTitan("Zeke");
beast.speak("You know, it's almost like throwing a baseball");
// Zeke says, "You know, it's almost like throwing a baseball"

And if we want to override a method from the parent class, we can do that too:

class Titan {
  constructor(name) {
    this.name = name;
  }

  speak() {
    // this gets overridden in the BeastTitan class
    console.log("*titan noises*");
  }
}

class BeastTitan extends Titan {
  speak() {
    console.log(`${this.name} says, "I'm the Beast Titan"`);
  }
}

const pureTitan = new Titan("Eren's mom");
pureTitan.speak();
// *titan noises*

const beast = new BeastTitan("Zeke");
beast.speak();
// Zeke says, "I'm the Beast Titan"

Assignment

Create two new classes, SMSSender and EmailSender, that extend the base Sender class. They should both override the sendMessage method.

SMSSender's sendMessage method should log "Sending SMS to RECIPIENT: MESSAGE" to the console.
EmailSender's sendMessage method should log "Sending email to RECIPIENT: MESSAGE" to the console.

RECIPIENT and MESSAGE should be replaced with the recipient field and the given message parameter.