hash的'floor'值？

Question

我有一个默认值为0的哈希: Hash.new(0)

假设一个整数值,有没有办法设置'floor',这样如果该值低于楼层,那么该楼层会被返回？

例:

h = Hash.new(0)
h.floor = 0

h[:five] += 5
h[:five] 
#=> 5

h[:negative_five] -= 5
h[:negative_five] 
#=> 0

Answer 1

这是一个可能的实现

class MyHash < Hash
    attr_writer :floor

    def [](key)
        # you can use one of those two lines or your own code in case the floor hasn't been define
        # raise 'floor value must be defined' if @floor.nil?
        # super key if @floor.nil?
        value = (fetch(key) < @floor ? @floor : fetch(key))
    end
end