Checking Property Type?
How would you check the type of a property (i.e. if a string or number or Vector3 value)
Example:
local x = Vector3.new(0, 1, 5)
if x.PropertyType == "String" then
print("x is a string")
elseif x.PropertyType == "Vector3" then
print("x is a Vector value")
end
Obviously this is just an example and I need to know how to actually do it.
Sorry if this doesn't follow all guidelines for posting questions.
2 answers
Type
Roblox has a built-in method called type. This allows you to check the type of data values. However, if you try it on a Vector3, it will return 'userdata'.
For example:
print(type("Hello!"))
--string
print(type(3))
--integer/number
print(type(true))
--boolean
Using this, you can check other datavalues too.
local x = Vector3.new(0, 1, 5)
if type(x) == "string" then
print("x is a string")
elseif type(x) == "userdata" then
print("x is a userdata")
end
Also a list of data types can be found here:
1
0
0
In addition to DigitalVeer's answer about the "type" function, you have these options:
-ClassType property (for Roblox objects)
-You can try to access a property without fear of an error using pcall:
function HasProp(obj, prop) --returns true if "obj" has the property "prop"
local success, value = pcall(function() return obj[prop] end)
return success
end
function TryGetProp(obj, prop) --returns the specified property of "obj" if it exists, or else nil
local success, value = pcall(function() return obj[prop] end)
if success then
return value
else
return nil
end
end
function WhatIs(obj) --returns the type or ClassName of obj, if available
if type(obj) == "userdata" then
return TryGetProp(obj, "ClassName") or "userdata"
end
return type(obj)
end
function MightBeVector3(obj) --returns true if obj might be a Vector3
return type(obj) == "userdata" and HasProp(obj, "X") and HasProp(obj, "Y") and HasProp(obj, "Z")
end
print(WhatIs(Vector3.new())) --userdata
print(WhatIs(Instance.new("Part"))) --Part
print(MightBeVector3(Vector3.new())) --true
print(MightBeVector3(CFrame.new())) --true, since CFrame has X/Y/Z
print(MightBeVector3(Instance.new("Part"))) --false
You could further improve on the "WhatIs" and "MightBeVector3" functions as desired. ex, if you wanted to make sure that MightBeVector3 didn't return true on a CFrame, you could add and not HasProp(obj, "p"), since CFrames have a ".p" property.