Chapter 1: WASM Basics - Test-Driven WebAssembly Learning

Building Production-Ready WebAssembly with Ruchy

WebAssembly (WASM) represents the future of high-performance computing across platforms. With Ruchy v2.1.0’s native WASM compilation, you can write once and deploy everywhere - from browsers to edge computing platforms.

This chapter establishes WASM-first development patterns using Test-Driven Development (TDD) principles. Every example compiles to WebAssembly first, then validates in the REPL.

What You’ll Learn

Native WASM compilation with ruchy wasm
Cross-platform deployment patterns
Browser, Node.js, and serverless integration
Performance optimization for WASM modules
Security validation and quality metrics

WASM-First Development Workflow

The New Standard Pattern

// 1. Write Ruchy function
fun add(a: i32, b: i32) -> i32 {
    a + b
}

// 2. Compile to WASM
// ruchy wasm add.ruchy -o add.wasm --target browser

// 3. Deploy to platform  
// ruchy wasm add.ruchy --deploy --deploy-target cloudflare

// 4. Validate in REPL
// >>> add(5, 3)
// 8

Supported Deployment Targets

Ruchy v2.1.0 supports immediate deployment to:

Browser: Interactive web applications
Node.js: High-performance server modules
Cloudflare Workers: Edge computing functions
AWS Lambda: Serverless microservices
Vercel: JAMstack deployment
Deno: Modern runtime integration

Quality Gates for WASM

Every WASM module must pass:

# Compile with validation
ruchy wasm source.ruchy -o output.wasm --verbose

# Check module quality
ruchy score output.wasm  # Must score ≥ 0.8

# Validate security
ruchy wasm output.wasm --security-check

# Performance analysis
ruchy runtime output.wasm

Next Steps

Begin with WASM Arithmetic & Compilation to master the fundamentals.

Every WASM module in this book is production-tested across all deployment targets. Quality demonstrated, not promised.

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