return function (propertyNameCapital)
    local propertyNameLower = string.lower(propertyNameCapital)
    
    local mixin = {}
    mixin["get" .. propertyNameCapital] = function (self)
        assert(self[propertyNameLower] ~= nil)
        return self[propertyNameLower]
    end
    mixin["set" .. propertyNameCapital] = function (self, property)
        self[propertyNameLower] = property
        return self
    end
    return mixin
end