C vs JavaScript

Simple example of a performance comparison between a JavaScript and a C implementation of the Fibonacci sequence.

Getting Started

Prerequisites

• Emscripten
• Python

Building

1. Go to the fibonacci root directory.
2. Build the WebAssembly module:

emcc fibonacci.c -o fibonacci.c.js -s EXPORTED_FUNCTIONS="['_fibonacciC']" -s EXPORTED_RUNTIME_METHODS='["ccall", "cwrap"]' -O3

3. Check the build result.

Running

1. Go to the fibonacci root directory.
2. Start a web server:

python -m http.server

3. Check the console for the URL.

Testing

1. Go to http://[::]:8000/ in the browser.
2. Open the browser console.
3. Call the JavaScript Fibonacci function:

Math.fibonacciJS(40);

4. Call the C Fibonacci function:

Math.fibonacciC(40);

5. Compare the results.