Subscriptions

Subscriptions are commonly associated with the Observable pattern. A Subscription is used to listen to and react to changes in an observable stream. When you subscribe to a subject, it starts executing and emitting values.

A Subject is a special type of observable that allows multicasting (emitting values to multiple subscribers) and enables manually pushing values into the stream.

Purpose: Subscriptions and subjects together enable Data Sharing Across Components — share state without input/output properties. It allows data sharing between:

• Parent master layout and child master layout
• Master layout and interface
• Interface and custom component
• Custom component and custom component