I have a table + dictionaries in it, and it just returns 0, what’s the issue?
local icons = {
a = 1;
b = 2;
Common = {
"rbxassetid://5069961595";
};
["Rare"] = {
"rbxassetid://5069962024";
};
["Epic"] = {
"rbxassetid://5069961746";
};
["Legendary"] = {
"rbxassetid://5069961928";
};
["Exotic"] = {
"rbxassetid://5069961848";
};
}
print(#icons)
Outputs:
0
The # operator only gets the length of the table’s array part. So you’ll need something like
local function len(t)
local n = 0
for _ in pairs(t) do
n = n + 1
end
return n
end
That’s alright, works for me!
get this to 30 characters
Also, I need to get one of the images from within the table, so I want to choose a random rarity, and random image within that rarity, this is what I currently have but it errors cause I can’t really think of a way…
local icons = {
Common = {
"rbxassetid://5069961595";
};
Rare = {
"rbxassetid://5069962024";
};
Epic = {
"rbxassetid://5069961746";
};
Legendary = {
"rbxassetid://5069961928";
};
Exotic = {
"rbxassetid://5069961848";
};
}
local n = rand:NextInteger(1,len(icons))
print(n)
print(icons[n])
local img = rand:NextInteger(1,icons[n])
print(img)
icon.Image = img
Players.Korrow.PlayerGui.ScreenGui.LocalScript:69: attempt to get length of a nil value
line 69: print(icons[n])
local probability = { -- Change the 'Chance' variable to the desired probability
{Type = "Common", Chance = 1};
{Type = "Rare", Chance = 0.2};
{Type = "Epic", Chance = 0.1};
{Type = "Legendary", Chance = 0.03};
{Type = "Exotic", Chance = 0.01};
}
local loot = {
Common = {
"rbxassetid://5069961595";
};
Rare = {
"rbxassetid://5069962024";
};
Epic = {
"rbxassetid://5069961746";
};
Legendary = {
"rbxassetid://5069961928";
};
Exotic = {
"rbxassetid://5069961848";
};
}
local function reverse(t)
for i = 1, math.floor(#t/2) do
local j = #t - i + 1
t[i], t[j] = t[j], t[i]
end
return t
end
local function getType(buff, RNG)
local rarity = math.min(RNG:NextNumber() + buff, 1)
local items = { }
for i, v in next, probability do
if v.Chance >= rarity then
table.insert(items, v)
end
end
return reverse(items)[1]
end
local function getLoot(buff)
-- 'buff' to decrease odds of rarer items being present
local RNG = Random.new()
buff = buff or 0
local item = getType(buff, RNG)
return loot[item.Type][RNG:NextInteger(1, #loot[item.Type])]
end
table.foreach(getLoot(), print)
Wasn’t looking for the whole schematic for a random drop system but that’ll do! 
Glad that provided you with the solution.
Let me know if there’s anything you don’t understand.
What does foreach do?
eeeeeeeeeeeee
table.foreach is just is just a table iterator, similar to next or pairs, you pass it a function to enact with each table pair (index, value). I used it in that script just to print the results of the loot for you to see how it works - it’s actually a deprecated function as of Lua 5.1, only recommended for printing to output.
Just do:
local new_loot = getLoot()
I don’t know if this is a cause to re-write everything, but if I were to now - add a list of items to each rarity, how would I go for it?
local loot = {
Common = {
["Item1"] = {
name = "Common";
icon = "rbxassetid://5069961595";
}
};
Rare = {
["Item1"] = {
name = "Rare";
icon = "rbxassetid://5069962024";
}
};
Epic = {
["Item1"] = {
name = "Epic";
icon = "rbxassetid://5069961746";
}
};
Legendary = {
["Item1"] = {
name = "Legendary";
icon = "rbxassetid://5069961928";
}
};
Exotic = {
["Item1"] = {
name = "Exotic";
icon = "rbxassetid://5069961848";
}
};
}
Example Table.
So if you want to continue using the script I sent you above, then you’d need to modify your table like so:
local loot = {
Common = {
{name = "Item1", rarity = "common", icon = "some_ref"},
{name = "Item2", rarity = "common", icon = "some_ref"},
{name = "Item3", rarity = "common", icon = "some_ref"}
};
Rare = {
{name = "Item1", rarity = "rare", icon = "some_ref"}
};
Epic = {
{name = "Item1", rarity = "epic", icon = "some_ref"}
};
Legendary = {
{name = "Item1", rarity = "legendary", icon = "some_ref"}
};
Exotic = {
{name = "Item1", rarity = "exotic", icon = "some_ref"},
{name = "Item2", rarity = "exotic", icon = "some_ref"}
};
}
The reason being is how I selected the random object within that rarity class, I used a [number] index reference, you can’t select it by a string key randomly unless you built a function to do so.
Okay, so how can I get the properties of the item?
I tried this and it works:
local imgLoot = getLoot()
for i,v in pairs(imgLoot) do -- IS THIS AN EFFICIENT WAY?
if i == "icon" then
icon.Image = v
end
end
icon.Image = imgLoot[icon] -- THIS DOES NOT WORK.
Also don’t want to have to iterate through it every time…
Please read this link so you better understand tables
You’re refering the imgLoot array with a variable ‘icon’, which I imagine hasn’t been defined as a string value of ‘icon’. This means that you’re effectively referencing imgLoot[nil], or from your application, looks like you’re referencing the imgLoot table with the ImageLabel object… You would need to do one of the following:
icon.Image = imgLoot.icon
-- or
icon.Image = imgLoot['icon']
I agree my questions are naive and I make these small mistakes 
But I appreciate your help!
FYI: If you wanted a metatable approach then you could achieve this with the __len metamethod, __len is invoked when the # operator is used.
For example:
local Dictionary = setmetatable({
A = 1;
B = 2;
}, {
__len = function(self) --// Function will be equivalent to incapaz's len function
local Count = 0;
for _ in pairs(self) do --// self is the actual table
Count = Count + 1;
end
return Count;
end
});
print(#Dictionary); --// 2