code: def cachier(label, time = 30, &block)
        var = "@_cachier_#{label}"
        cache = instance_variable_get(var) || {}
        return cache['data'] if cache['timestamp'] && Time.now <= cache['timestamp'] + time
        cache['timestamp'] = Time.now
        cache['data'] = block.yield
        instance_variable_set(var, cache)
        cache['data']
      end
docs: =>    Cache    <= 
  
   => Cache Return of a Function