What's the table version of "ChildAdded"?

Help and Feedback Scripting Support
#1

I’m trying to make an inbox thing where a player’s message goes into a table called “Inbox” and I want to check for when a message is added, cause I just do table.insert(inbox, message).

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#2

If it automatically added to the table cant you just check for when the player chats?

#3

It’s not automatically added, it first goes through a whole filter thing I made before it’s either accepted and placed into the inbox, or just ignored.

#4

Alright. You could make it so once it added it sends that information to whatever telling that something was added

#5

I might try __newindex but I’m not sure if it’ll work

#6

You can use RemoteEvent, BindableEvent, ETC to achieve this if you’re trying to communicate to another script or whatever.

#7

yeah but it’s part of a whole process so I don’t want to use a whole bunch of bindable events

#8

I dont think theres really any preformance changes if you use alot of bindables and stuff unless you’re trying to be clean it shouldn’t be a problem

#9

Just create a function that you call instead of table.insert.

function addToInbox(message)
    table.insert(inbox, message)
    -- do extra stuff
end

If you’re into it, you could use a method on an Inbox class instead.

In general, for code clarity I would recommend avoiding relying on metatable methods like __newindex. It makes it so that you can’t trust what basic Lua operators like t[k] = v will do, it’s a power that must be used with great care.

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Get When Item is Added to a Table
#10

this is the code

function methods:AddToInbox(player, message)
	local inbox = self.InboxChannel
	table.insert(inbox, {player, message})
end

function methods:HandleInbox()
	local inbox = self.InboxChannel
	inbox.__newindex = function(self, index, value)
		print("New inbox: ", index, value)
	end
end

I’m trying to make it so that when “AddToInbox” is used, and inserts the thing into inbox, then inbox does what I need it to (but I haven’t added that yet)

#11

Coudn’t you just call that function after it adds?

#12

Oh good idea, thanks!

#13

__newindex, but you can’t use table.insert.

local metatable = {}

function metatable:__newindex(key, value)
    print("New index", key, value)
end

local list = setmetatable({}, metatable)
list[#list + 1] = "value" --You have to use list[#list + 1] = instead of table.insert since the latter doesn't call __newindex.

-- Output
-- New index 1 value
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