What is the IsA event used for?
What is the IsA event used for and how could I use it when trying to make a game?
4 answers
IsA() is used to check if an instance's ClassName is the same as what you specify. For example:
1 | if object:IsA("BasePart") then |
This will check if the object is a BasePart. You can find the ClassName of an instance in its properties. Here's some more information if you need it: https://www.robloxdev.com/api-reference/function/Instance/IsA
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What is the IsA event used for? If you're looking to change multiple objects in a parent to something that you want it to be.
How could I use it? Well, if makes your script a lot neater. If you have multiple objects in a Folder, and you want all the specific objects to either destroy or do something you want it to. You would get all those specific objects in that.
Example:
1 | for i, v in pairs(Folder:GetChildren()) do |
2 |
3 | if v:IsA("BoolValue") then |
4 | v:Destroy() |
5 | end |
6 |
7 | end |
Hoped this help alot!
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What is IsA()
IsA() is a function(not a event). It takes only one parameter
Function Overview
1 | Object:IsA(string className) |
This returns a boolean. This boolean is if it is actually part of the class or if the object you are checking inherits from the class.
Function Example
01 | local brick = game.Worksapce:WaitForChild("Baseplate") |
02 | local isAPart = brick:IsA("Part") -- Returns true |
03 |
04 | -- isABasepart true as well because Part |
05 | -- inherits from the BasePart class |
06 | local isABasepart = brick:IsA("BasePart") |
07 |
08 | local isARemoteEvent = brick:IsA("RemoteEvent") -- Returns false |
09 |
10 | print("IsA Part:",isAPart) --> IsA Part: true |
11 | print("IsA BasePart:",isABasepart) --> IsA BasePart: true |
12 | print("IsA RemoteEvent:",isARemoteEvent) --> IsA RemoteEvent: false |
Pretty much Object:IsA("BasePart") is
1 | local brick = game.Workspace:WaitForChild("Baseplate") |
2 | local isABasepart = brick:IsA("Part") or brick:IsA("Union") or brick:IsA("MeshPart") |
This is an alternative to:
01 | local brick = game.Worksapce:WaitForChild("Baseplate") |
02 | local isAPart = brick.ClassName == "Part" --true |
03 |
04 | -- When we check if our brick variable is equal to "BasePart" |
05 | -- It will return false because in properties(find ClassName) |
06 | -- it would say Part |
07 | local isABasepart = brick.ClassName == "BasePart" |
08 |
09 | local isARemoteEvent = brick.ClassName == "RemoteEvent" -- Returns false |
10 |
11 | print("IsA Part:",isAPart) --> IsA Part: true |
12 | print("IsA BasePart:",isABasepart) --> IsA BasePart: false |
13 | print("IsA RemoteEvent:",isARemoteEvent) --> IsA RemoteEvent: false |
Use Cases
I find IsA() to play a decent role in a game. Let's say an example: We are iterating through a model. We have several bool values. Instead of manually coding for them to be true, you iterate the model.
Without IsA()
1 | for _,child in next,script.Parent:GetChildren() do -- same as pairs(script.Parent:GetChildren()) |
2 | child.Value = true |
3 | end |
The problem about the code snippet above is that we are assuming that the child we are currently at is a BoolValue.
What can we do to fix this code?
With IsA()
1 | for _,child in next,script.Parent:GetChildren() do |
2 | -- There wouldn't be an error because |
3 | -- we aren't assuming we are working with a BoolValue |
4 | if child:IsA("BoolValue") then |
5 | child.Value = true |
6 | end |
7 | end |
With IsA(), we don't have to worry if our assumption, every child in the model is a BoolValue, making us error.
What if we had Parts,Unions and MeshParts in our model?
Let's say we want to make them Transparent. We can easily do this by adding a elseif statement.
1 | for _,child in next,script.Parent:GetChildren() do |
2 | if child:IsA("BoolValue") then |
3 | child.Value = true |
4 | -- Remember, Parts,Unions and Meshes inherit from the BasePart class |
5 | elseif child:IsA("BasePart") then -- An alternative conditional |
6 | child.Transparency = 1 |
7 | end |
8 | end |
Conclusion
Pretty much IsA() can help you a little in you game development life. Hopefully you learned a lot from this answer!
