is_a? Method that tells you whether an object has a given class either as its class or as one of its class’s ancestral classes:

>> mag =
=> #<Magazine:0x36289c>
>> mag.is_a?(Magazine)
=> true
>> mag.is_a?(Publication)
=> true

respond_to? – the method that lets you determine in advance whether an object knows how to handle a particular method – can come in handy.


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