Interactive Holidays Demo with WASM on Fermyon Cloud

Here we test calling a serverless WASM function deployed to Fermyon Cloud. This interactive demo allows you to explore holidays for different years, showcasing the power of WebAssembly in serverless environments.

About This Demo

This application demonstrates:

Serverless WASM: Running WebAssembly functions in a serverless environment
Fermyon Cloud: Utilizing Fermyon’s cloud platform for WASM deployment
Interactive UI: Real-time holiday calculations based on user input
Modern Web Stack: Integration with Astro and React components

Try It Out

The widget below connects to a WASM function deployed on Fermyon Cloud to calculate holidays for the year 2025.

Technical Implementation

The backend is built using:

Rust: For the core holiday calculation logic
WebAssembly: Compiled target for maximum performance
Fermyon Spin: Framework for building serverless WASM applications
Fermyon Cloud: Hosting platform for the WASM functions

Source Code

If you’re interested in the technical details, you can find the complete source code here:

Repository: https://github.com/sweisser/holiday

This project showcases how modern web applications can leverage WebAssembly for computationally intensive tasks while maintaining excellent performance and portability across different platforms.

Why WASM + Serverless?

The combination of WebAssembly and serverless computing offers several advantages:

Performance: Near-native execution speed
Portability: Run anywhere with consistent behavior
Security: Sandboxed execution environment
Efficiency: Smaller binary sizes compared to traditional containers
Language Flexibility: Write in Rust, C++, or other compiled languages