---
name: reactive-programming-39b85c4ed3d7
description: >
  Implement reactive programming patterns using RxJS, streams, observables, and
  backpressure handling. Use when building event-driven UIs, handling async data
  streams, or managing complex data flows.
---

# Reactive Programming

## Table of Contents

- [Overview](#overview)
- [When to Use](#when-to-use)
- [Quick Start](#quick-start)
- [Reference Guides](#reference-guides)
- [Best Practices](#best-practices)

## Overview

Build responsive applications using reactive streams and observables for handling asynchronous data flows.

## When to Use

- Complex async data flows
- Real-time data updates
- Event-driven architectures
- UI state management
- WebSocket/SSE handling
- Combining multiple data sources

## Quick Start

Minimal working example:

```typescript
import {
  Observable,
  Subject,
  BehaviorSubject,
  fromEvent,
  interval,
} from "rxjs";
import {
  map,
  filter,
  debounceTime,
  distinctUntilChanged,
  switchMap,
} from "rxjs/operators";

// Create observable from array
const numbers$ = new Observable<number>((subscriber) => {
  subscriber.next(1);
  subscriber.next(2);
  subscriber.next(3);
  subscriber.complete();
});

numbers$.subscribe({
  next: (value) => console.log(value),
// ... (see reference guides for full implementation)
```

## Reference Guides

Detailed implementations in the `references/` directory:

| Guide | Contents |
|---|---|
| [RxJS Basics](references/rxjs-basics.md) | RxJS Basics |
| [Search with Debounce](references/search-with-debounce.md) | Search with Debounce |
| [State Management](references/state-management.md) | State Management |
| [WebSocket with Reconnection](references/websocket-with-reconnection.md) | WebSocket with Reconnection |
| [Combining Multiple Streams](references/combining-multiple-streams.md) | Combining Multiple Streams |
| [Backpressure Handling](references/backpressure-handling.md) | Backpressure Handling |
| [Custom Operators](references/custom-operators.md) | Custom Operators |

## Best Practices

### ✅ DO

- Unsubscribe to prevent memory leaks
- Use operators to transform data
- Handle errors properly
- Use shareReplay for expensive operations
- Combine streams when needed
- Test reactive code

### ❌ DON'T

- Subscribe multiple times to same observable
- Forget to unsubscribe
- Use nested subscriptions
- Ignore error handling
- Make observables stateful


---
Source attribution: aj-geddes
Original project: https://github.com/aj-geddes/useful-ai-prompts/blob/3f5182cfd739fc113f4af5244a1cf342ad7f7911/skills/reactive-programming/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Copyright (c) 2025 AJ Geddes

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.


# Mega AI Hub resource metadata

Creator / publisher: aj-geddes
Original project: https://github.com/aj-geddes/useful-ai-prompts/blob/3f5182cfd739fc113f4af5244a1cf342ad7f7911/skills/reactive-programming/SKILL.md
Attribution basis: Source repository record

Fields of work: Design, Development & Engineering, Product Management
Roles: Backend Developer, Frontend Developer, Full-Stack Developer, Product Manager, UX Designer
Specialties: Backend, Cross Platform, Frontend
Tools: Rxjs
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: fd3761ac30a631354a8aef352bc3ef46ed8ef3d28fe6d6a0264db0e441d172d5