#Ruby# Introspect (2)
3. Looking at Classes
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superclass => get the parent of any particular class
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ancestors => get both superclasses and mixin modules
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在Ruby1.9中，任何未指定的class都继承自Object，而Object继承自BasicObject，BasicObject无superclass。
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4. Looking inside Classes
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str = %q{puts "hello".length}eval str # => 5?
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