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Difference between revisions of "LUA"
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| − | + | Lua is a portable [[interpreted languages|interpreted language]]. It is mainly used in Games, however it is also used by [[nmap|NMAP]]'s Scripting Engine | |
| − | [[ | + | |
| + | <font size="-2">Special thanks to [[User:Trep|Trep]] for his contributions to this article.</font> | ||
| + | =Comments= | ||
| + | {{code|text= | ||
| + | <source lang="lua"> | ||
| + | -- This is a single line comment | ||
| + | </source> | ||
| + | }} | ||
| + | {{code|text= | ||
| + | <source lang="lua"> | ||
| + | --[[ | ||
| + | This | ||
| + | is | ||
| + | a | ||
| + | multi-line | ||
| + | comment | ||
| + | ]] | ||
| + | </source> | ||
| + | }} | ||
| + | |||
| + | |||
| + | =Variables= | ||
| + | Variables in Lua are very simple. it is not required to declare the variable's data type, just assign a value. | ||
| + | {{code|text= | ||
| + | <source lang="lua"> | ||
| + | Var = 1 | ||
| + | Var2 = "Im a var!" | ||
| + | Var3 = 2 | ||
| + | Var4 = Var * Var3 | ||
| + | |||
| + | </source> | ||
| + | }} | ||
| + | ==Global Variables vs Local Variables== | ||
| + | |||
| + | When Variables in lua are declared, they are globally accessible unless otherwise specified with ''local''. | ||
| + | |||
| + | {{code|text= | ||
| + | <source lang="lua"> | ||
| + | GlobalVar = 0 | ||
| + | local LocalVar = 1337 | ||
| + | </source> | ||
| + | }} | ||
| + | |||
| + | =Functions= | ||
| + | Functions in lua are quite easy as well. | ||
| + | {{code|text= | ||
| + | <source lang="lua"> | ||
| + | function SimpleAddition(x,y,z) | ||
| + | local Sum = x + y + z --only accessible from within this context. | ||
| + | SumTimesTwo = Sum * 2 -- can be referenced from anywhere in the current file, or wherever file is loaded. | ||
| + | return Sum | ||
| + | end | ||
| + | </source> | ||
| + | }} | ||
| + | |||
| + | |||
| + | =Tables= | ||
| + | Lua tables are a bit like arrays, except that an array is.. well an array of values. | ||
| + | A Table, is an array of Keys, and those Keys have values. | ||
| + | |||
| + | |||
| + | ====Declaring an empty Table==== | ||
| + | {{code|text= | ||
| + | <source lang="lua"> | ||
| + | MyTable = {} --declares an empty table. | ||
| + | </source> | ||
| + | }} | ||
| + | ====Declaring, and populating a Table==== | ||
| + | {{code|text= | ||
| + | <source lang="lua"> | ||
| + | Numbers = {"one","Two","Three","Four","Five"} | ||
| + | </source> | ||
| + | }} | ||
| + | The above declaration is exact to the one below | ||
| + | {{code|text= | ||
| + | <source lang="lua"> | ||
| + | Numbers = {} | ||
| + | Numbers[1] = "one" | ||
| + | Numbers[1] = "Two" | ||
| + | Numbers[1] = "Three" | ||
| + | Numbers[1] = "Four" | ||
| + | Numbers[1] = "Five" | ||
| + | </source> | ||
| + | }} | ||
| + | |||
| + | ====Indexing Tables==== | ||
| + | {{Protip|Unlike what you would expect, the index for a table starts at 1, instead of 0.}} | ||
| + | {{code|text= | ||
| + | <source lang="lua"> | ||
| + | Numbers = {"one","Two","Three","Four","Five"} | ||
| + | print(Numbers[0]) -- prints nil, as index starts at 1. | ||
| + | print(Numbers[1]) -- prints "one" | ||
| + | </source> | ||
| + | }} | ||
| + | |||
{{programming}}{{social}} | {{programming}}{{social}} | ||
| + | |||
| + | [[Category:Interpreted languages]][[Category:Programming Languages]] | ||
Latest revision as of 03:43, 20 September 2012
Lua is a portable interpreted language. It is mainly used in Games, however it is also used by NMAP's Scripting Engine
Special thanks to Trep for his contributions to this article.
Contents
Comments
-- This is a single line comment
|
--[[
This
is
a
multi-line
comment
]]
|
Variables
Variables in Lua are very simple. it is not required to declare the variable's data type, just assign a value.
Var = 1 Var2 = "Im a var!" Var3 = 2 Var4 = Var * Var3 |
Global Variables vs Local Variables
When Variables in lua are declared, they are globally accessible unless otherwise specified with local.
GlobalVar = 0 local LocalVar = 1337 |
Functions
Functions in lua are quite easy as well.
function SimpleAddition(x,y,z) local Sum = x + y + z --only accessible from within this context. SumTimesTwo = Sum * 2 -- can be referenced from anywhere in the current file, or wherever file is loaded. return Sum end |
Tables
Lua tables are a bit like arrays, except that an array is.. well an array of values. A Table, is an array of Keys, and those Keys have values.
Declaring an empty Table
MyTable = {} --declares an empty table. |
Declaring, and populating a Table
Numbers = {"one","Two","Three","Four","Five"} |
The above declaration is exact to the one below
Numbers = {} Numbers[1] = "one" Numbers[1] = "Two" Numbers[1] = "Three" Numbers[1] = "Four" Numbers[1] = "Five" |
Indexing Tables
Protip: Unlike what you would expect, the index for a table starts at 1, instead of 0.
Numbers = {"one","Two","Three","Four","Five"} print(Numbers[0]) -- prints nil, as index starts at 1. print(Numbers[1]) -- prints "one" |
