snippet.lua

local stored_functions = {}

function create_function(arg_names, body)
	return function(...)
		local args = {...}
		
		local env = setmetatable({}, { __index = getfenv() })
		for index, an in ipairs(arg_names) do
			env[an] = args[index]
		end
		
		local func = stored_functions[body] or loadstring(body)
		stored_functions[body] = func
		setfenv(func, env)
		return func()
	end
end


print(create_function({"i"}, "return i+2")(5))  -- "|i| return i+2"
print(create_function({"i", "j"}, "return i+j")(5,10))  -- "|i,j| return i+j"
print(create_function({"i", "j", "k"}, "return i+j+k")(5,10,11))  -- "|i,j,k| return i+j+k"