Build Your Own RxJS Pipeable Operators by John Lindquist

• Create a Generic Subscriber in RxJS
• Extend Subscriber to Override `_next` in RxJS
• Connect a Source to a Subscriber with RxJS `pipe`
• Use `lift` to Connect a `source` to a `subscriber` in RxJS
• Create a Reusable Operator from Scratch in RxJS
• Create Operators from Existing Operators in RxJS
• Implement the `map` Operator from Scratch in RxJS
• Chain RxJS Operators Together with a Custom `pipe` Function using Array.reduce
• Implement RxJS `mergeMap` through inner Observables to Subscribe and Pass Values Through
• Implement RxJS `switchMap` by Canceling Inner Subscriptions as Values are Passed Through
• Implement RxJS `concatMap` by Waiting for Inner Subscriptions to Complete
• `add` Inner Subscriptions to Outer Subscribers to `unsubscribe` in RxJS