for k,v in ..... do.... explained?

[shouryuu]

I've never understood what the following statement ment:

local _, class = UnitClass('player')
local _, class = UnitClass('player')

Global_options = {'a','b','c'}
WARRIOR_options = {'d','e','f'}
ROGUE_options = {'g','h','i'}

for k,v in getglobal(class .. '_options') do
    table.insert(Global_options, v)
end

I understand what it does, it gets the global called class and inserts it in the Global_option table with v as it's key. Wht I don't understand is the k and v statements. What are they? Do they have a numerical value? What does the "in" do? I really don't understand anything at all

[mondinga]

For each key & it's value as k & v in table, do something. In this case, iterating over the WARRIOR_options array would return first k=1, v=d, then k=2, v=e, and finally k=3, v=f.

[shouryuu]

Lol I fell kinda dumb :P I've really been having problems with lua and talbes Thanks mate.