像 Lua 那样引用 Hash 元素
galeki
posted @ 2008年7月03日 18:45
in RoR
with tags
ruby hash lua
, 4778 阅读
Lua 中的 Table 可以拿来当作多种数据格式来使用，比如 Hash ( Dictionary )：
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h = {a=1,b=2,c=3}
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print(h['a'])
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1
最爽的是，可以用 h.a 这种形式来引用 Hash 中的元素：
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print(h.a)
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1
利用 Ruby 的 method_missing，也可以这样爽一把，仅仅需要：
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class Hash
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def method_missing(method, *args)
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self[method]
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end
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end
即可，测试：
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h = {:a => 1, :b => 2, :c => 3}
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puts h.a
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1
只要 hash 的 key 不要与 Hash 内置的方法重名就可以了～ 
啥？还要实现赋值？ 这个好办，只要将上面的代码改为：
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class Hash
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def method_missing(method, *args)
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if method.to_s =~ /=$/
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self[method.to_s.chop.to_sym] = *args
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else
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self[method]
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end
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end
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end
就可以了，测试：
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h = {:a => 1, :b => 2}
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h.a = 456
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puts h.a
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456
感觉不错～
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