meaning of "for k,v"?

[Ghilliedman]

i'm sorry this is probably the worst question to ask, but i've been cross-referencing different code segments in many gamemodes, and i come across the statement "for k,v" or "for k,v in pairs". could someone explain what this means, and give a short example please?, thank you very much :)

[3mpty]

k,v is shorthand for Key,Value, used in tables.

Value is the thing you're enterring and Key is the "ID" it's given.

[Yobdren]

Basically, it loops through every entry in the table, where k is the index and v is the value.

[JSharpe]

[lua]
tbl = { 1, "testing" }
tbl.test = "table"

for k,v in pairs(tbl) do
print("in our \"" .. k .. "\" key there is: \"" .. v .. "\" as the value")
end
[/lua]

This out puts:

in our "1" key there is: "1" as the value
in our "2" key there is: "testing" as the value
in our "test" key there is: "table" as the value

[Yobdren]

They can be replaced by any other two letters, such as c,d or h,f.

[Ghilliedman]

thank you very much, could you give me a situation where this would be useful maybe?

[JSharpe]

[QUOTE=Yobdren;17167975]They can be replaced by any other two letters, such as c,d or h,f.[/QUOTE]

This, however k and v seem more logical since they are rarely used anywhere else, small and easy to remember. Though some tend to use _ instead of k as a dummy if you don't use it.

[editline]01:49AM[/editline]

[QUOTE=Ghilliedman;17168036]thank you very much, could you give me a situation where this would be useful maybe?[/QUOTE]

[lua]
for k, v in pairs(player.GetAll()) do
v:Kill() --Kill all players on a server.
print( "Killed " .. v:Name() ) -- Print to the console who we killed
end
[/lua]

[Ghilliedman]

Thanks guys! you've helped me a lot!
20 kudos to everyone who posted!

[Yobdren]

[QUOTE=JSharpe;17168037]This, however k and v seem more logical since they are rarely used anywhere else, small and easy to remember. Though some tend to use _ instead of k as a dummy if you don't use it.[/QUOTE]

It's a critical piece of information if you intend to have for loops in for loops.