#Ruby# Introspect (1)_Ruby_编程开发_程序员俱乐部

? ? ?Introspect，内省，是指从程序自身出发，审视程序各方面的能力。这个过程又称为Reflection，反射。

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? ? ?孔子曰，吾日三省吾身。于人于程序，内省都是非常重要的。

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1. Looking at objects

ObjectSpace.each_object([module]) {|obj| ... } -> fixnum

ObjectSpace.each_object([module]) ? ? ? ? ? ? ?-> an_enumerator

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ObjectSpace::each_object :?

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Calls the block once for each living, nonimmediate object in this Ruby?process.(Immediate objects (Fixnums, Symbols true,false, and nil) are never returned.?)

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If module is specified, calls the block for only those?classes or modules that match (or are a subclass of) module.?Returns the number of objects found.

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2. Looking inside objects

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methods

respond_to?(symbol, include_private=false)?Private methods are?included in the search only if the optional second parameter evaluates to?true.

kind_of??Returns true if class is the class of obj, or if?class is one of the superclasses of obj or modules included in?obj. instance_of?