Lua lua kkey array substitution in loop

[Lupek]

Hello i have simple problem, i dont know lua too good.

positions = {
    x = 1026, y = 981, z = 7
}


function onStepIn(creature, item, position, fromPosition)
-
-
-
for i, value in pairs(positions) do
    creature:sendTextMessage(MESSAGE_STATUS_CONSOLE_BLUE, position.i) -- its not working for me
end

I want to substitute array key to creature object.
I want this effect:
position.x
position.y
position.z

just use [] brackets it's better way!