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Learn WebAssembly

You're reading from   Learn WebAssembly Build web applications with native performance using Wasm and C/C++

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Product type Paperback
Published in Sep 2018
Publisher Packt
ISBN-13 9781788997379
Length 328 pages
Edition 1st Edition
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Author (1):
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Mike Rourke Mike Rourke
Author Profile Icon Mike Rourke
Mike Rourke
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Table of Contents (12) Chapters Close

Preface 1. What is WebAssembly? 2. Elements of WebAssembly - Wat, Wasm, and the JavaScript API FREE CHAPTER 3. Setting Up a Development Environment 4. Installing the Required Dependencies 5. Creating and Loading a WebAssembly Module 6. Interacting with JavaScript and Debugging 7. Creating an Application from Scratch 8. Porting a Game with Emscripten 9. Integrating with Node.js 10. Advanced Tools and Upcoming Features 11. Other Books You May Enjoy

Building the C portion


The C portion of the application will aggregate transaction and category amounts. The calculations we perform in C could be done just as easily in JavaScript, but WebAssembly is ideal for computation. We'll dive deeper into more complex usage of C/C++ in Chapter 8Porting a Game with Emscripten, but for now we're trying to limit our scope to what can be done within the confines of the Core Specification. In this section, we'll write some C code to demonstrate how to integrate WebAssembly with a web application without the use of Emscripten.

Overview

We will write some C functions that calculate the grand totals as well as the ending balances for raw and cooked transactions. In addition to calculating the grand totals, we need to calculate the totals for each category for display in the pie charts. All of these calculations will be performed in a single C file and compiled down to a single Wasm file that will be instantiated when the application loads. C can be a little...

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