table question please

MoKaLux

I can't insert k, v in a table, could you please help me?
I have this code:

local world = r3d.World.new(0, gravityy, 0) -- 0, -9.8, 0 world.missiles = {}   stage:addEventListener(Event.ENTER_FRAME, function(e) if isshoot then shoot() end end)   function shoot() local missile, missileobj = MISSILES(world, "3d_models/missiles", "missile03.obj", MISSILE_BIT, ENEMY_BIT) world.missiles[missile] = missileobj print(#world.missiles) -- TABLE ALWAYS EMPTY! end

MISSILES returns missile and missileobj.
The table is always empty! Do you see anything wrong?
Thank you in advance for your help

hgy29

Nothing is wrong, but the '#' operator is not what you think, it only gives the length of an array (with keys being sequential numbers starting from 1). It doesn't work for hash maps.

To check for a table emptyness use next(table) instead.

MoKaLux

thank you hgy29. Still learning lua . I have just found out how ipairs work thanks to your sample code and now I can't live without it

hgy29

About the # operator: https://www.lua.org/manual/5.1/manual.html#2.5.5

rrraptor

MoKaLux said:

thank you hgy29. Still learning lua . I have just found out how ipairs work thanks to your sample code and now I can't live without it

Also, ipairs(table) - iterate over number keys, pairs(table) - for any key.

local t = { a = 123, b = 321, [1] = "asd", [2] = "LOL", [7] = 45, [{}] = "TABLE KEY" }   for i,v in ipairs(t) do print(i,v) end print(string.rep("-", 8)) for i,v in pairs(t) do print(i,v) end

MoKaLux

MoKaLux said:

thank you hgy29. Still learning lua . I have just found out how ipairs work thanks to your sample code and now I can't live without it

I found my error: I wanted to use pairs instead of ipairs debugging fun

MoKaLux

cadeau

a yt series should start shortly (God's willing).
PS: I did all the 3d graphics this time (blender)
PS2: having the best time of my life thanks to gideros