Method Overriding

A child class can override a parent method to provide specialized behavior.

override.ts

class Notification {
    message: string;

    constructor(message: string) {
        this.message = message;
    }

    format(): string {
        return this.message;
    }
}

class UrgentNotification extends Notification {
    format(): string {
        return `URGENT: ${this.message.toUpperCase()}`;
    }
}

const rawMessage: string = ;
const notice: Notification = new UrgentNotification(rawMessage);
const formatted: string = notice.format();

console.log(formatted);

class Notification {
    message: string;

    constructor(message: string) {
        this.message = message;
    }

    format(): string {
        return this.message;
    }
}

class UrgentNotification extends Notification {
    format(): string {
        return `URGENT: ${this.message.toUpperCase()}`;
    }
}

const rawMessage: string = ;
const notice: Notification = new UrgentNotification(rawMessage);
const formatted: string = notice.format();

console.log(formatted);

class Notification {
    message: string;

    constructor(message: string) {
        this.message = message;
    }

    format(): string {
        return this.message;
    }
}

class UrgentNotification extends Notification {
    format(): string {
        return `URGENT: ${this.message.toUpperCase()}`;
    }
}

const rawMessage: string = ;
const notice: Notification = new UrgentNotification(rawMessage);
const formatted: string = notice.format();

console.log(formatted);

override An overriding method has the same name as the parent method and runs for the child instance.