When it comes to creating WebAssembly modules, we usually start with a higher level language like C++. The compilation process involves a few steps which are managed by tools provided by the WebAssembly ecosystem. Most prominently, we have the Emscripten SDK, which is a complete compiler toolchain that allows us to compile C++ code into wasm modules.

Let's demonstrate this process with a simple C++ program that prints out a welcome message. Consider the following code snippet:

1#include <iostream>
2using namespace std;
3int main() {
4  cout << "Welcome to WebAssembly!";
5  return 0;
6}

The above C++ program can be compiled into a wasm module using Emscripten. To run this program in a web environment, we would also need some JavaScript to load and execute the compiled wasm module. We will delve into this JavaScript-WebAssembly interoperation in a subsequent section of this tutorial. For now, it's key to understand how familiar languages like C++ can be utilized to create performant, secure wasm modules for the web.

Remember the significant performance improvement we are targeting with the use of WebAssembly in our web applications. The above code is the initial step—the creation of wasm modules from higher level languages.

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#include <iostream>

using namespace std;

int main() {

  cout << "Welcome to WebAssembly!";

  return 0;

}