Scripting Helpers is winding down operations and is now read-only. More info→
Log in to vote
2
Why does this error on me? [pcall]
I was looking through the function dump page, and saw pcall. When I tried testing it as so, I get
'Baseplate' is not a valid member of Workspace
Don't think I'm misspelling anything wrong.
When I put in BasePlate, it prints yes
I'm trying to test the condition with an object that doesn't exist
1 | oExists = function(thing) |
2 | local success,msg = pcall(function() return thing ~= nil end) |
3 | if success then |
4 | return true |
5 | end |
6 | return false |
7 | end |
8 | print(oExists(workspace["Baseplate"]) and "yes" or "no") |
0
pcall is almost never the answer. In particular, just reading this code, the function `pcall` is given can't ever error. BlueTaslem 18071 — 10y
1 answer
Log in to vote
2
The problem is this part:
1 | workspace["Baseplate"] |
If there is no object named "Baseplate" in Workspace, that statement will error, as you are attempting to reference a nil value outside of the protected call. To make this function work as you would like it to, you could do something like this:
1 | local oExists = function(directory, thing) |
2 |
3 | local success = pcall(function() return not not directory[thing] end) |
4 |
5 | return success |
6 |
7 | end |
8 |
9 | print(oExists(workspace, "Baseplate") and "yes" or "no") |
But honestly, you could just use directory:FindFirstChild(string object_name), which is much easier.