Hand-written by Joseph San Nicolas, Roblox Developer

RBXScriptSignal

Constructors

Name	Description
An Instance's built-in event property, e.g. BasePart.Touched or Players.PlayerAdded	Not created by calling a constructor - an RBXScriptSignal is exposed as a built-in event property on an Instance. RBXScriptSignal has no direct constructor of its own.

Code Snippet

local Players = game:GetService("Players")

Players.PlayerAdded:Connect(function(player)
    print(player.Name, "joined the game")
end)

local hitSignal: RBXScriptSignal = workspace.Part.Touched
hitSignal:Once(function(hit)
    print("First touch by", hit.Name)
end)

Methods

Name	Parameters	Returns	Description
Connect(func: function):RBXScriptConnection	Func: function	RBXScriptConnection	Establishes a function to be called whenever the event fires. Returns an RBXScriptConnection that can be used to stop listening.
ConnectParallel(func: function):RBXScriptConnection	Func: function	RBXScriptConnection	Establishes a callback that runs in a desynchronized state when the event fires, letting it run in parallel across multiple cores. Requires the calling script to be rooted under an Actor. More efficient than pairing Connect() with task.desynchronize().
Once(func: function):RBXScriptConnection	Func: function	RBXScriptConnection	Establishes a function to be called only the next time the event fires, automatically disconnecting itself right after that first call.
Wait():Variant	Void	The arguments passed by the signal, as a tuple	Yields the current thread until the signal next fires, then resumes it and returns whatever arguments the event passed along.