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Difference between revisions of "LUA"
From NetSec
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A Table, is an array of Keys, and those Keys have values. | A Table, is an array of Keys, and those Keys have values. | ||
| − | + | ||
Declaring a Table: | Declaring a Table: | ||
{{code|text= | {{code|text= | ||
<source lang="lua"> | <source lang="lua"> | ||
MyTable = {} --declares an empty table. | MyTable = {} --declares an empty table. | ||
| + | </source> | ||
| + | }} | ||
| + | |||
| + | |||
| + | {{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> | ||
| + | }} | ||
| + | |||
| + | {{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> | </source> | ||
}} | }} | ||
Revision as of 20:48, 4 May 2012
Lua is a portable interpreted language. It is mainly used in Games, however it is also used by NMAP's Scripting Engine
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Variables
In Lua, variables are very simple, you don't even have to declare a datatype, all you need to do is assign a value.
Var = 1 Var2 = "Im a var!" Var3 = 2 Var4 = Var * Var3 |
Global Variables vs Local Variables
When you declare a variable in Lua, it is 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 a Table:
MyTable = {} --declares an empty 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" |
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" |
