File: polymorphism

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<entry index='p'>
<name>Polymorphism</name>
<reference>receiver</reference>
<reference>method</reference>
<reference>object</reference>
<reference>ruby</reference>
<content>
    To define actual operation as to an ((object|Object)).

    ((Ruby)) carries it out to choose the ((method|Method)
    according to the object of the ((receiver|Receiver)).

    : Example:                              
        obj = "abc"
        print obj.length, "\n"        # => 3
        obj = [1,2,3,4]
        print obj.length, "\n"        # => 4
</content>
</entry>