how to setup env in angular app, pipes asynch pure impure, subject and subject behavior only theory

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Setting up environment in Angular app, understanding pipes, async, pure/impure, Subject and BehaviorSubject in theory

Setting up environment in Angular app involves configuring environment files for different environments like development, production, etc.
Pipes in Angular are used for transforming data in templates. Async pipes are used for handling asynchronous data streams.
Pure pipes are stateless and only recompute when the input values change, while impure pipes can be called on every change detection cycle.
Subjects in RxJS are both an observable and an observer. They can emit values to multiple subscribers.
BehaviorSubjects are a type of Subject that stores the latest value and emits it immediately to new subscribers.

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