Foreword

Welcome to The Ruchy Programming Language book. This is not just another programming language tutorial - it’s a living, breathing document that evolves with the language itself.

Our Philosophy

Ruchy was born from a simple observation: modern programming languages often sacrifice simplicity for power, or ease of use for performance. We believe you shouldn’t have to choose.

Ruchy brings together:

• The simplicity of Python
• The performance of Rust
• The expressiveness of functional programming
• The practicality of systems programming

Implementation-First Documentation

Every code example in this book:

• Compiles with the current Ruchy compiler
• Is tested automatically in our CI pipeline
• Produces the exact output shown
• Can be copied and run immediately

We don’t document features that don’t exist. We don’t make promises about future functionality. What you see is what works, today.

How to Use This Book

This book is organized in progressive levels:

1. Start with Level 0 if you want to write scripts quickly
2. Continue to Level 1 when you need to build applications
3. Advance to Level 2 for systems programming
4. Explore Level 3 for language mastery

You don’t need to read every chapter. Pick the level that matches your goals and dive in.

A Living Document

This book is synchronized with the Ruchy compiler. When new features are added to the language, they appear here. When behaviors change, the examples update. This is not a snapshot - it’s a mirror of the current implementation.

Let’s begin your journey with Ruchy.