What do these codes do?

@_realnickk thanks for your great explanation. Is it possible to acces a game developer's moderator gui with a script like this. 

Simple Explanation:

FindFirstChild: can be used in an if statement, tries to find whatever is called, if not then false

example:

if (workspace:FindFirstChild("RandomPart") then

--random code

end

Fire: used for remoteevents, used to actually turn on the remoteevent.

example:

local revent = workspace.RemoteEvent

revent:FireServer(script.name)

Invoke: i dont actually know what this means so ill let roblox developer studio handle this

Invoke will call the OnInvoke callback and return any values that were returned by the callback (if any). If the OnInvoke callback is not set, this method will yield until one is set. If OnInvoke yields, this method will also yield. There are limitations on the values that can be sent as arguments; see the code samples.

example:

1. local bf = script.Parent
2.  
3. -- Define a function for use with the BindableFunction
4. local function AddTwoNumbers(a, b)
5. return a + b
6. end
7.  
8. -- Set the OnInvoke callback to be our function
9. bf.OnInvoke = AddTwoNumbers
10.  
11. -- Invoke the BindableFunction
12. print(bf:Invoke(25, 44))

I've seen some codes like:

FindFirstChild

Fire...

Invoke...

What do these codes do? Where can I use them? Which one can I use in what kind of script?

So, let's start off with the first function you listed.

Instance<T>:FindFirstChild(<string> ChildName) is an example of the first one lets say we had a hierarchy such as this one:

https://cdn.discordapp.com/attachments/806571765396144228/807238618619969606/ColorPart_explorer.png

ColorPart is the parent of the child (ColorChangeScript), that may sound like nothing if you're new, but you'll learn how parents of children work in lua.

In this case, we'd do this:

local colorchangescript = workspace:FindFirstChild("ColorPart") -- Will get the script under the part as a child.

Hope this helps, and now we should do Fire in lua! Here's the function desc: BindableEvent<T>:Fire(<string> Scriptname)

Example:

 local binding_event = script.Parent

 

local function event_temp(...) -- Define a simple function to connect to the env

print(...)

end

 

binding_event.Event:Connect(event_temp)

Too lazy to do invoke, but hope this helps.