Now that we've covered the workings behind WebAssembly, let's dive deeper and create our first wasm module. As a seasoned developer who is also interested in product design and marketing, you might find this process similar to creating a groundbreaking product from scratch and launching it into the market.

For this module, we will use a simple Fibonacci sequence generator written in C++. Fibonacci sequence is a series of numbers in which each number is the sum of the two preceding ones. Akin to understanding user patterns in marketing, we are creating logic to understand and reproduce a mathematical pattern.

Take a look at the accompanying C++ code. The extern "C" declaration is used to achieve C linkage for the fib function, meaning it can be accessed from a variety of programming languages, including JavaScript. This is similar to ensuring your product is compatible with different platforms in the market.

In a product development analogy, compiling this C++ code to create a WebAssembly module is like finalizing your product design and launching it into the market. In the following sections, we'll learn how to interact with our wasm module using JavaScript, just like a customer would with your product.

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#include <iostream>

using namespace std;

​

extern "C" {

​

  int fib(int n) {

    if (n <= 1) return n;

    return fib(n - 1) + fib(n - 2);

  }

​

}

​

int main() {

  cout << "Fibonacci sequence:

";

  for (int i = 0; i < 10; i++) cout << fib(i) << ' ';

  cout << endl;

  return 0;

}