TryExceptElseFinally.lua

local methodsAvilable = {else = true, except = true, finally = true}
local function MethodConstructor(fromMeta, name)
	return function(func)
		fromMeta.methodsCalled[name] = func
		return fromMeta
	end
end
local function EndResult(fromMeta, resultType, intermediateResult)
	if resultType == 2 and fromMeta.methodsCalled["else"] then
		fromMeta.methodsCalled["else"](table.unpack(intermediateResult))
	elseif resultType == 1 or resultType == 3 and fromMeta.methodsCalled["except"] then
		fromMeta.methodsCalled["except"](table.unpack(intermediateResult))
	end
	if fromMeta.methodsCalled["finally"] then
		fromMeta.methodsCalled["finally"](table.unpack(intermediateResult))
	end
	fromMeta.methodsCalled = nil
	fromMeta = nil
end
local function TryMethod(fromMeta, func)
	local resultType, intermediateResult = 0, {}
	local success, err = pcall(function() 
		func(function(...)
			resultType = 2
			intermediateResult = {...}
			EndResult(fromMeta, resultType, intermediateResult)
		end, function(...)
			resultType = 3
			intermediateResult = {...}
			EndResult(fromMeta, resultType, intermediateResult)
		end)
	end)
	if resultType > 1 then return end
	EndResult(fromMeta, success and 2 or 1, {err} or intermediateResult)
end
return function(func: (resolve: any?, reject: any?) -> ())
	local tryMethod = setmetatable({
		methodsCalled = {}
	}, {__index = function(fromMeta, index)
		if methodsAvilable[index] then
			return MethodConstructor(fromMeta, index)
		end
	end, __call = function(fromMeta, yield: boolean?)
		if not yield then
			print(fromMeta)
			task.spawn(TryMethod, fromMeta, func)
			return
		end
		TryMethod(fromMeta, func)
	end,})
	return tryMethod
end