Factory Pattern: Notification Creator

Problem

A NotificationService creates different notification objects based on type: EMAIL, SMS, PUSH. Currently it has a giant switch-case inline. Extract a NotificationFactory that encapsulates object creation, so adding a new channel (e.g. SLACK) requires zero changes to NotificationService.

Requirements

▸Notification interface with: send(recipient, message), getChannel()
▸EmailNotification, SMSNotification, PushNotification each implement it
▸NotificationFactory.create(type: string): Notification
▸NotificationService uses factory — has no switch/if on type
▸Show adding SlackNotification: only add new class + register in factory

Constraints

–NotificationService must not contain any type-switch logic
–Factory should throw a clear error for unknown types

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