WorldSwitch

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{{#invoke:WorldSwitch|subworld|Survial 4|Husky}} generates: Script error: The module returned a nil value. It is supposed to return an export table.

{{#invoke:WorldSwitch|world|Survial 4|Husky}} generates: Script error: The module returned a nil value. It is supposed to return an export table.

local p = {} --p stands for package

function p.subworld(frame)
	input = mw.ustring.lower(frame[1] .. frame[2])
	subworlds = {"husky", "beagle", "akita", "corgi", "labrador", "shepherd"}
	for key,value in ipairs(subworlds) do 
		if (mw.ustring.find(input, value, 1, true) ~= nil) then
			return value
		end
	end
end

Module

WorldSwitch