Beginning Lua with World of Warcraft Add-ons by Paul Emmerich

By Paul Emmerich

Global of Warcraft is the most well-liked online game on this planet, with greater than 11.5 million lively subscribers world wide. each considered one of them is made conscious of the provision of components (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 web site) have downloaded Paul Emmerich’s add-on package deal, lethal Boss Mods. complete multi-million buck video games are much less well known than lethal Boss Mods, and the recognition and value of lethal Boss Mods to international of Warcraft play can't be overstated; his components are thought of required downloads for severe international of Warcraft player-teams (“guilds”). starting Lua with international of Warcraft accessories capitalizes at the powerful curiosity of WoW avid gamers in editing their online game stories by means of leveraging Paul Emmerich’s recognition to create curiosity in studying Lua and XML, and provides guide at the fundamentals of Lua grounded on actual coding event. either WoW gamers, and people drawn to studying Lua might be drawn through routines rigorously designed to compare the reader’s constructing ability point. WoW avid 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, reliable didactic paintings that courses them via Lua in a enjoyable and easy-to-implement context.

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Example text

It returns the value of the array part of a table. Remember, the array part starts at the index 1 and goes to the last set integer index. So an array with holes contains an array part and a hash table, and the length operator use only the array part. lnejp$P]^ha%)):, We don’t have the index 1 in our table, so the length of the array part is 0. Y9^(W/Y9_y So the length of the array is clearly 3. Now adding a value under the index 100 leaves a hole in our array, so the length of the actual array is still 3.

This type means that something does not have a useful value; for example, a variable that is not initialized is jeh. Trying to get the return value of a function that does not return anything also gives you jeh. jqi^an Lua knows only one type of number, while other programming languages distinguish between integers and decimal numbers of different sizes. The most common data types for numbers you might encounter when programming in other languages are double-precision floating point numbers (`kq^ha), ejp, qjoecja`ejp, hkjc, and qjoecja` hkjc.

Tables are used to implement all data structures you are going to need. A data structure is a smart way to store data so that it can be accessed or modified efficiently. Tables have their own section in this chapter, so this is just a brief overview over them. The simplest way to use a table is as an array, which is basically just a list of values: P]^ha9w](3(_()-y This creates a new table containing the values ], 3, _, and )- in this order. Each value can now be read from a table by providing its index, the number representing its sequential position in the array.

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