Data Composition with RxJS
summary
Declarative RxJS code keeps HTTP responses as observables bound with the async pipe so there are no subscriptions (async pipe) and components use onPush change detection. Streams are composed to resolve foreign keys and aggregates using combineLatest to join products and categories, selection is handled by an action Subject for selections that drives detail rendering, and responses are cached with shareReplay caching so returning to the page reuses data without refetching.
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