Wiley-World.of.Warcraft.Programming.A.Guide.and.Reference.for.Creating.WoW.Addons

xviContentsExtending Tables with Metatables 68Adding a Metatable 68Defining Metamethods 69Defining Basic Arithmetic Using ___add, ___sub, ___mul,and ___div 70Defining Negation Using ___unm 71Creating Meaningful Output with ___tostring 71Concatenating Tables Using ___concat 72Exploring Fallback Tables with ___index 72Catching Creation of Keys with ___newindex 74Bypassing Metatables 75value = rawget(tbl, key) 75rawset(tbl, key, value) 76Summary 76Chapter 5 Advanced Functions and Control Structures 77Multiple Return Values 77Converting Hex to RGB 77Assigning Multiple Values 78Missing Return Values? 79Multiple Return Values in World of Warcraft 79Using a Dummy Variable 80Using the select() Function 81Accepting a Variable Number of Arguments 81Declaring a Vararg Function 82Using select() with ... 83Generic for Loops and Iterators 84Syntax of Generic for 84Traversing the Array Part of a Table 85Traversing an Entire Table 86Clearing a Table 86Using Other Iterators 87Sorting an Array of Table Data 87Define Example Data 88Default Sort Order 88Creating a Comparison Function 88Creating a More Complex Sort Function 89Summary 90Chapter 6 Lua Standard Libraries 91Table Library 92str = table.concat (table [, sep [, i [, j]]]) 92table.insert (table, [pos,] value) 92max = table.maxn (table) 93