Book Image

Lua Quick Start Guide

By : Gabor Szauer
4 (1)
Book Image

Lua Quick Start Guide

4 (1)
By: Gabor Szauer

Overview of this book

Lua is a small, powerful and extendable scripting/programming language that can be used for learning to program, and writing games and applications, or as an embedded scripting language. There are many popular commercial projects that allow you to modify or extend them through Lua scripting, and this book will get you ready for that. This book is the easiest way to learn Lua. It introduces you to the basics of Lua and helps you to understand the problems it solves. You will work with the basic language features, the libraries Lua provides, and powerful topics such as object-oriented programming. Every aspect of programming in Lua, variables, data types, functions, tables, arrays and objects, is covered in sufficient detail for you to get started. You will also find out about Lua's module system and how to interface with the operating system. After reading this book, you will be ready to use Lua as a programming language to write code that can interface with the operating system, automate tasks, make playable games, and much more. This book is a solid starting point for those who want to learn Lua in order to move onto other technologies such as Love2D or Roblox. A quick start guide is a focused, shorter title that provides a faster paced introduction to a technology. It is designed for people who don't need all the details at this point in their learning curve. This presentation has been streamlined to concentrate on the things you really need to know.
Table of Contents (10 chapters)

File IO

At some point, programs will need to work with persistent data. This section explores writing and reading data to and from the hard drive. Lua provides facilities to read and write files through its io library. A file doesn't have to contain textual data; you can store data as a binary representation. Reading and writing binary data with Lua is also possible.

Opening a file

When writing to a file or reading from a file, that file needs to be opened first. Lua provides the io.open function to open files. On success, the io.open function will return a file handle. On failure, it will return nil:

file = io.open("my_file.txt"); -- Opens existing file in read only mode

The preceding line of code will open...