We have traversed through the low-level guts of WebAssembly, compiled C++ code into WASM modules, debugged them, and then called those functions from JavaScript. It's time to bring all these aspects together and look at an end-to-end example of a practical application.

Let's assume we are building a real-time basketball game analytics web application where we need high-speed computations done on every move of a player in an ongoing game. The application needs to analyze moves in real-time and suggest strategies to coaches. The computational intensity of this task can bog down JavaScript performance.

Given our good understanding of C++, we can write the core algorithms as C++ code and compile that to WebAssembly. Let's see a very basic use case. We are writing a simple C++ program, compiling it to WASM, and then using it in a web page.

Here is the basic C++ code that we want to compile to WASM:

1#include <iostream>
2using namespace std;
3int main() {
4  // This will output to the browser console
5  std::cout << "Hello World!"
6}

This C++ code, when written into a .cpp file, can be compiled using Emscripten into a WASM module. This module can be imported into your JavaScript application and its functions can then be called directly from JavaScript.

This example is a simple case, and in a real application, the C++ code would be far more complex. However, the process remains the same. Compile the C++ code into a WASM module, import it into your JavaScript application, and then call the WASM functions from JavaScript. This means you can use WASM to speed up any computations done by your web application while also being able to use the web technologies you are familiar with for designing the UI/UX.

This way, WebAssembly, JavaScript, and C++ come together to form a web application that is both user-friendly and performance-optimized.

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#include <iostream>

using namespace std;

int main() {

  // This will output to the browser console

  std::cout << "Hello World!"

}