A practical guide to RxJS multicast operators, covering `share` and `shareReplay`. The `share` operator makes a cold observable hot by multicasting to multiple subscribers, with configurable reset behavior via `resetOnComplete`, `resetOnError`, and `resetOnRefCountZero` options. The `shareReplay` operator extends this by replaying a configurable number of previously emitted values to late subscribers. Code examples demonstrate each operator's behavior with multiple subscriptions at different time intervals.
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