Why should you care?

Admin extends User avoids duplicating shared fields and methods.

See it live — copy this example

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class Animal {
  speak() { return "..."; }
}
class Dog extends Animal {
  speak() { return "Woof!"; }
}
console.log(new Dog().speak());

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What happened?

• extends links Dog to Animal.
• Dog overrides speak.
• super.speak() would call the parent version.

Practice next

1. Run Dog extends Animal example.
2. Add constructor(name) { super(); this.name = name; }.
3. Call super.speak() from an override.
4. Create Admin extends User that adds isAdmin: true in constructor.
5. Override greet in child to prepend a role prefix.

Remember

extends Parent super() in constructor Override methods in child

ScriptVerse role hierarchy

AdminUser extends BaseUser to add permission checks while reusing login and profile logic.

Outcome: Inheritance shares common code without duplicating authentication flows.