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Super

The super keyword allows us to call methods on an object's parent. It's often used to call a parent's constructor method when the child object has its own.

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

  toString() {
    return `Titan - Name: ${this.name}`;
  }
}

class BeastTitan extends Titan {
  constructor(name, power) {
    // call the parent's constructor
    super(name);
    this.power = power;
  }

  toString() {
    // call the parent's `toString` method
    return `${super.toString()}, Power: ${this.power}`;
  }
}

const beast = new BeastTitan("Zeke", 9000);
console.log(beast.toString());
// Titan - Name: Zeke, Power: 9000

Assignment

They've decided that Sender subclasses should only be responsible for formatting the message. Both SMSSender and EmailSender should have a formatMessage method that calls the base Sender's formatMessage method, but appends either " [SMS]" or " [Email]" to the end of the message, depending on the subclass. For example:

To: [email protected], Message: You up? [SMS]