Managing Side Effects Functionally

What problem does it solve?

This Skill teaches how to control side effects in TypeScript by separating pure core logic from impure shells, enabling predictable behavior, easier testing, and safer composition.

Core Features & Use Cases

• Pure core, impure shell pattern: Build business logic as pure functions and shield all side effects behind a minimal impure interface.
• IO and effect management: Use IO-like abstractions and functional patterns to sequence effects deterministically.
• Idempotence and quarantining: Implement idempotent operations and quarantine impure code for safer retries and testing.
• Use Case: Example: model a simple workflow where calculation of totals is pure and data persistence is impure, showing easy testing and retries.

Quick Start

Demonstrate a minimal TypeScript example showing a pure function computing a total and an impure shell performing a console.log side effect.