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)

Error-handling in Lua

Lua does not officially support exceptions. But, a similar mechanism can be built with pcalls, or protected calls. An exception halts the flow of code in case of an error, and returns control to the caller right away. Furthermore, some kind of error code is likely provided to the caller. This method of raising errors immediately should, in theory, allow callers to handle unsafe code gracefully.

Much like debugger.lua, third-party Lua modules for profiling already exist. Unsurprisingly, one of the best modules for profiling is profile.lua. You can learn more about profile.lua and download it here: https://bitbucket.org/itraykov/profile.lua

pcall and error

Lua's most efficient way to handle errors...