How do I check if a property exists for a certain thing?
So what exactly I'm trying to accomplish is I'm trying to make it so that if in a iv loop the v im looking for has a property named size but it keeps erroring at local script saying that local script does not have a size which I put a if not then to return end but it keeps doing the same thing erroring on LocalScript
Can anyone help ?
1 | for i,v in pairs(game.StarterGui.ScreenGui:GetDescendants()) do |
2 | if v.Size == true then |
3 | print(v.Name..'has size') |
4 | if not v.Size then |
5 | return |
6 | end |
7 | end |
8 |
9 | end |
1 answer
You could use pcall(), which catches errors and prevents them from breaking your script. Calling a function with pcall() will return two or more values: the first one is a bool (true or false) which indicates if the called function ran without error, and the rest are any values returned by the called function.
Below, hasSizeProperty will be true if the inner function doesn't throw an error.
Furthermore, size will be set to v.Size.
01 | for i, v in pairs(game.StarterGui.ScreenGui:GetDescendants()) do |
02 | local hasSizeProperty, size = pcall(function() |
03 | return (v.Size ~= v:FindFirstChild("Size")) and v.Size |
04 | end) |
05 | if hasSizeProperty then |
06 | print(v.Name .. " has size " .. tostring(size)) |
07 | else |
08 | -- do something when v does not have a property called "Size" |
09 | end |
10 | end |
1
0