This first edition was written for Lua 5.0. While still largely relevant for Lua 5.1, there are some differences.
The second edition targets Lua 5.1 and is available at Amazon and as an e-book.
By buying the book, you also help to support the Lua project.
 |
Programming in Lua |  |
| Part II. Tables and Objects Chapter 13. Metatables and Metamethods |
The metamethods for arithmetic and relational operators all define behavior for otherwise erroneous situations. They do not change the normal behavior of the language. But Lua also offers a way to change the behavior of tables for two normal situations, the query and modification of absent fields in a table.
| Copyright © 2003–2004 Roberto Ierusalimschy. All rights reserved. | |