Zig WASM Factorial - Zig-wasm Typing CST Test
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Zig WASM Factorial — Zig-wasm Code
Calculates factorial recursively and prints the result.
# zig/demo/factorial.zig
const std = @import("std");
fn factorial(n: i32) i32 {
if (n <= 1) return 1;
return n * factorial(n - 1);
}
pub export fn factorial(n: i32) void {
std.debug.print("Factorial: {d}\n", .{factorial(n)});
}Zig-wasm Language Guide
Zig is a general-purpose programming language designed for robustness, optimality, and simplicity. With Zig-Wasm, developers can compile Zig code to WebAssembly, enabling high-performance, low-level applications in the browser or other Wasm runtimes.
Primary Use Cases
- ▸Porting system-level libraries to WebAssembly
- ▸High-performance game engines or simulations in the browser
- ▸Cryptography, compression, or other CPU-intensive algorithms
- ▸Replacing C/C++ Wasm modules with safer, simpler Zig code
- ▸Low-level WASI (WebAssembly System Interface) applications
Notable Features
- ▸Direct compilation to WebAssembly (Wasm32 target)
- ▸No hidden runtime or garbage collector
- ▸C interop for leveraging existing code
- ▸Manual memory management with safety options
- ▸Simple, readable, and maintainable syntax
Origin & Creator
Zig is created by Andrew Kelley, with the community contributing to language development, compiler improvements, and WebAssembly support.
Industrial Note
Zig-Wasm is particularly useful for developers who need predictable, high-performance WebAssembly modules, low-level memory control, or integration with C/C++ codebases for web execution.
Quick Explain
- ▸Zig allows direct compilation to WebAssembly for running low-level code in browsers or servers.
- ▸Focuses on safety, performance, and predictable behavior without a garbage collector.
- ▸Supports manual memory management and fine-grained control over execution.
- ▸Provides interoperability with C and other languages, making it versatile for Wasm projects.
- ▸Ideal for system-level code, games, and performance-critical web applications.
Core Features
- ▸Compile-time code execution for optimization
- ▸Error handling without exceptions
- ▸Explicit memory control for performance-critical modules
- ▸Cross-compilation support including Wasm targets
- ▸Lightweight standard library suitable for Wasm
Learning Path
- ▸Learn Zig language fundamentals
- ▸Understand WebAssembly basics
- ▸Compile Zig modules to wasm32 target
- ▸Integrate Wasm module with JavaScript frontend
- ▸Optimize and debug Zig-Wasm for performance
Practical Examples
- ▸Math library compiled to Wasm for frontend use
- ▸Audio or image processing in browser via Zig-Wasm
- ▸Cryptography routines executed securely in Wasm
- ▸Game physics engine modules
- ▸Compression/decompression utilities for web apps
Comparisons
- ▸Zig-Wasm vs Rust-Wasm: Zig is lower-level, simpler, no borrow checker; Rust has stronger type safety and ecosystem
- ▸Zig-Wasm vs C/C++-Wasm: Zig safer syntax, modern compiler, easier cross-compilation
- ▸Zig-Wasm vs AssemblyScript: Zig offers manual memory control and system-level features; AssemblyScript is TS-like with GC
- ▸Zig-Wasm vs Go-Wasm: Zig has smaller runtime and more predictable memory behavior
- ▸Zig-Wasm vs TinyGo: Zig focuses on performance and low-level control, TinyGo targets small Go programs to Wasm
Strengths
- ▸Predictable and deterministic performance
- ▸Safe alternative to C for low-level WebAssembly
- ▸Small runtime footprint, ideal for Wasm
- ▸Easier debugging than C/C++ in Wasm
- ▸High interoperability with other languages and platforms
Limitations
- ▸Smaller ecosystem compared to Rust or JS frameworks
- ▸No built-in reactive or UI framework
- ▸Requires manual memory and resource management
- ▸Limited high-level abstractions for web development
- ▸Debugging in browser WebAssembly can be challenging
When NOT to Use
- ▸Applications requiring high-level web frameworks
- ▸Projects needing large JavaScript ecosystem libraries
- ▸Rapid prototyping with minimal low-level code
- ▸Teams unfamiliar with manual memory management
- ▸UI-heavy projects needing reactive frameworks
Cheat Sheet
- ▸zig init-exe -> create new Zig executable project
- ▸zig build-exe src/main.zig -target wasm32-freestanding -> compile to Wasm
- ▸zig test -> run unit tests
- ▸zig fmt -> format code
- ▸zig run src/main.zig -> run locally for testing
FAQ
- ▸Is Zig-Wasm free?
- ▸Yes - Zig is open-source and free
- ▸Does it require a runtime?
- ▸No, compiled Wasm runs in browser or Wasm runtime
- ▸Can I use Zig for UI frameworks?
- ▸Not directly - Zig-Wasm is low-level, use JS glue for frontend
- ▸Is memory managed automatically?
- ▸No, Zig uses manual memory management with optional safety checks
- ▸Does Zig interoperate with C?
- ▸Yes - full C interoperability for libraries or legacy code
30-Day Skill Plan
- ▸Week 1: Zig syntax, pointers, slices, error unions
- ▸Week 2: Compile-time execution and memory management
- ▸Week 3: Exporting functions to Wasm and JS interop
- ▸Week 4: Optimize binary size and execution speed
- ▸Week 5: Integrate with WASI, JS frameworks, or C libraries
Final Summary
- ▸Zig-Wasm enables low-level, high-performance WebAssembly modules.
- ▸Ideal for system-level, CPU-intensive, or deterministic tasks in the browser.
- ▸No garbage collector, manual memory control, small runtime footprint.
- ▸Seamlessly interoperates with JS, C, and WASI runtimes.
- ▸Perfect for developers seeking predictable, efficient, and safe WebAssembly applications.
Project Structure
- ▸src/ - Zig source files
- ▸build.zig - optional build script
- ▸out/ - compiled WebAssembly output
- ▸tests/ - unit tests for Zig modules
- ▸examples/ - sample usage of Zig-Wasm modules
Monetization
- ▸Deliver high-performance web apps
- ▸Reduce backend computation via client-side Wasm
- ▸Port legacy C libraries safely to browser
- ▸Optimize Wasm modules for size-sensitive projects
- ▸Enable high-speed computation in SaaS products
Productivity Tips
- ▸Use build.zig scripts for repeatable builds
- ▸Write small, composable modules
- ▸Profile Wasm binaries for size and speed
- ▸Leverage compile-time execution for constants
- ▸Reuse code across Zig projects
Basic Concepts
- ▸Compile-time execution - code runs at compile time for optimization
- ▸Manual memory management - allocate/free memory explicitly
- ▸Error unions - lightweight error handling mechanism
- ▸Slices and pointers - low-level data structures for Wasm
- ▸Exported functions - callable from JavaScript