Pcall, ycall and xcall, Who's the best between the three?

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#1

I only know pcall, but when I wrote it in the studio, I sometimes got the name of xcall or ycall, are they better than pcall and should I use it?

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#3

pcall and ypcall are the same. ypcall was added long ago to allow yielding inside of a pcall, but pcall was then patched to yield as well.

xpcall allows you to set a custom error handler for when the function errors. useful for custom error logic.
example:

xpcall(function(...)
	print("[xpcall] got", ...)
	error("this should error")
end, function(e)
	print("an error occured", e)
	warn('[traceback]', debug.traceback())
	-- // more logic here
end, "a", 2, true, nil, {}, Vector3.new(0, 5, 0))

output:

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#4

Can you make it so that if there is an error that it automatically improves or that if there is an error that it then plays a function?

#5

You can do whatever you want in the error handler, so sure. A note for xpcall, it cannot yield iirc :frowning:

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#6

I don’t get it, could you please write a more normal function?
Exemple:

xcall(function(--???)
--Don't understand.
end

Edit: I find the Lua Globals Page. It means that (I’m just trying):

local Bool = true
local function Errorfunction()
    print("error😢")
end
local function Sucessfunction()
    print("sucess🙂")
end
local sucess, err = xpcall(function(), Errorfunction)
  --something
  if sucess then
     Sucessfunction() --if it is true (sucess), then play the Sucessfunction
  elseif err then
     err --it run the Errorfunction function if it is error
  end

end)
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#7

xpcall takes 3 arguments

  1. the function you want to run in protected mode
  2. the error handler (will only run if the function errors!)
  3. the arguments to pass to the function (only in roblox iirc)
local errored = false;
xpcall(function(...) -- ... is used when you want to accept any number of arguments.
print(...)
error("asd")
end, function(error)
errored = true
print("the function errored!", e)
end, 1,2,3,"asd")
-- the first function is the function we wamt to catch errors from
--the second function is our error handler, which allows us to handle the error in amy way we want (logging, retrying, etc)
-- the 1,2,3,"asd" are the arguments we pass to function one 

if errored then
print("errored :(")
else
print("not errored")
end

Functions | Documentation - Roblox Creator Hub (should help you understand how to use …)

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