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What is a parameter and how does it differ throughout different events?
I've been scripting for a few months, and I know how scripts work such as if someone writes
1 | part = game.Workspace.part |
2 |
3 | part.Touched:connect(function(hit) |
4 | hit.Parent.Humanoid.Health = 0 |
5 |
6 |
7 | end) |
it'll kill the character and hit is the person who touched the part.
But when you're using GUIs and there are three parameters, I'm starting to wonder what these actually are so that I can use them correctly.
Can anybody describe them for me?
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What are parameters?
Parameters are the input for functions. They are predefined data holders for the arguments that the function will be called with.
1 | function blah(a) --Parameter |
2 | print(a+2); |
3 | end |
4 |
5 | blah(5) --Argument |
6 | --Output: 7 |
How do they differentiate between events?
Parameters for the functions that you connect to events are extremely useful, and most of the time a necessity for your code. These represent whatever the event returns.
Here's a couple examples -
- Touched event : returns the part that touched
1 | function onTouch(hit) --Parameter for event |
2 | print(hit.Name.." touched "..script.Parent.Name) |
3 | end |
4 |
5 | script.Parent.Touched:Connect(onTouch) |
- MouseClick event : returns the player who clicked
1 | function onClick(who) --Parameter |
2 | print(who.Name.." clicked "..script.Parent.Name); |
3 | end |
4 |
5 | script.Parent.ClickDetector.MouseClick:Connect(onClick) |
- PlayerAdded event : returns the player that joined
1 | function onPlayerEntered(plr) --Parameter |
2 | print(plr.Name.." joined the server!"); |
3 | end |
4 |
5 | game.Players.PlayerAdded:Connect(onPlayerEntered) |
-Edit-
To define multiple parameters, separate variable phrases by , commas.
1 | function sayhi(who,when) --multiple parameters separated by commas. |
2 | print(who.." said hi at "..when.." o'clock") |
3 | end |
4 |
5 | sayhi("Bob","2:00") --call it with multiple arguments |
6 | --Output : Bob said hi at 2:00 o'clock |
