Inheritance

A new class starts with everything from another class, then adds or changes things.

What is Inheritance in JavaScript?

Inheritance — A new class starts with everything from another class, then adds or changes things.

class Alert {
    text() {
        return "Alert";
    }
}

class EmailAlert extends Alert {
    text() {
        return "Email";
    }
}

Level: Journeyman · More JavaScript terms at this level

Updated September 27, 2026