WebAssembly modules are not easy to debug due to their low-level nature. However, Emscripten offers several ways to debug compiled wasm code which can be really beneficial in your web development workflow, especially considering your background in web development.

The first one is Emscripten's debug mode. When compiling your C++ code into wasm, you can use the -g flag to include debugging information in the output. This allows you to see more detailed error messages if something goes wrong.

1emcc -g main.cpp -o main.js

Additionally, modern browsers, like Chrome and Firefox, include outstanding devtools to step through the JavaScript code that interacts with the wasm module, inspect the memory and variables as well as view the wasm text format for easier understanding. They're expected to keep enhancing wasm's debugging capabilities, making life easier for developers.

Do note, however, that wasm debugging support is not yet as mature as JavaScript's. This can occasionally make things tougher, but it's rapidly improving. Your natural debugging instincts from your web developer experience will be invaluable here.

In the code block you see a simple C++ program. Try to change the value of the num variable and debug the program by seeing the output. This may seem simple, but getting the hang of these debugging features will greatly help you as you start working with more complex C++ and WebAssembly modules.

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#include <iostream>

using namespace std;

int main() {

  int num = 10;

  if(num == 5) {

    cout << "Number is 5";

  } else {

    cout << "Number is not 5";

  }

}