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28 lines
880 B
Markdown
28 lines
880 B
Markdown
# Comparing Class Hierarchy Relationships
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The comparator methods (`<`,`>`, etc.) can be useful for a lot of things. In
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Ruby, they can be used to compare classes in order to understand how they
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relate to one another on the class hierarchy.
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```ruby
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# Fixnum is a subclass of Integer
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> Fixnum < Integer
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=> true
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# Integer is not a subclass of Fixnum
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> Integer < Fixnum
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=> false
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# Fixnum and String are not related to one another
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> Fixnum < String
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=> nil
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```
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The `<` operator will tell you if there is a subclass relationship. The `>`
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operator will tell you if there is an ancestor relationship. When `nil`
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results, it means the two classes do not have a direct relationship.
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There are a few more of [these types of
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operators](http://ruby-doc.org/core-2.2.2/Module.html#method-i-3C) on the
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Module class.
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[source](http://kerrizor.com/blog/2015/05/14/serendipity-and-ruby-objects/)
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