By Paul Emmerich
International of Warcraft is the preferred game on this planet, with greater than 11.5 million energetic subscribers world wide. each one among them is made conscious of the supply of accessories (or “mods”) and consumer interface customizability. Of that 11.5 million at a conservative estimate 8,106,256 clients (not together with downloads from Paul Emmerich’s personal website) have downloaded Paul Emmerich’s add-on package deal, lethal Boss Mods. whole multi-million buck video games are much less renowned than lethal Boss Mods, and the recognition and significance of lethal Boss Mods to global of Warcraft play can't be overstated; his accessories are thought of required downloads for severe global of Warcraft player-teams (“guilds”). starting Lua with international of Warcraft accessories capitalizes at the powerful curiosity of WoW avid gamers in enhancing their online game reports via leveraging Paul Emmerich’s reputation to create curiosity in studying Lua and XML, and provides guideline at the fundamentals of Lua grounded on actual coding event. either WoW gamers, and people attracted to studying Lua could be drawn by way of routines conscientiously designed to check the reader’s constructing ability point. WoW gamers trying to maximize their online game adventure will locate the “never-though-of-that” instruments they wish, whereas these drawn to programming will find a readable, strong didactic paintings that publications them via Lua in a enjoyable and easy-to-implement context.
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Additional info for Beginning Lua with World of Warcraft Add-ons
The name is used in the code to identify the variable. The value is the content of the container, and this content is categorized into different data types. In our “Hello, World” example, we had the opnejc data type to store the text Dahhk(Sknh` The factorial example used many values of the type jqi^an to represent numbers. You can use different operations on different data types; for example, you can add two numbers, but trying to add two strings will result in an error message. You have already seen a few variables in the examples.
It tests whether its argument is jeh or b]hoa and returns pnqa if it is; otherwise it returns b]hoa. The operator kn can be written as a function to demonstrate how it works. % ebr]hqa-pdaj napqnjr]hqaahoa napqnjr]hqa. aj` aj` We have not discussed this eb)pdaj)ahoa)aj` construct yet. If you are not familiar with it from other languages, here is a short explanation of how it works; the following code shows the syntax. ebatlnaooekjpdaj ))^k`uahoa ))^k`u. aj` C H A P T E R 2 N LU A B A S I C S Lua checks whether atlnaooekj evaluates to a value that is considered to be true, that is, it is not false or nil.
The first code translates to: hk_]hbkk bkk9bqj_pekj$%aj` So when using the first way to define a function, the function is inside the scope of the local variable that holds the function. When using the second way, the scope of this variable starts after the function. Let’s go back to our function that calculates the factorial of a number and try to make it local. , It works just fine. But when you change the first line to hk_]hb]_9bqj_pekj$j% it now generates an error message: C H A P T E R 2 N LU A B A S I C S ]ppailppk_]hhchk^]h#b]_#$]jehr]hqa% as it tries to access a global variable b]_* So if you want to use the second way to assign a function to a local variable, you have to make sure that this function does not try to call itself or create the variable before assigning the function to it.
Beginning Lua with World of Warcraft Add-ons by Paul Emmerich