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Re:Ruby basics (1 viewing) (1) Guest
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TOPIC: Re:Ruby basics
#4607
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Inheriting Constants

Constants are inherited and can be overridden, much like instance methods can.

There is, however, a very important difference between the inheritance of methods and the inheritance of constants
 
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#4608
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Ruby issues a warning when a constant is redefined.
 
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
The Singleton Pattern

A singleton is a class that has only a single instance.

Singletons can be used to store global program state within an object-oriented framework and can be useful alternatives to class methods and class variables.
 
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Properly implementing a singleton requires a number of the tricks .

The new methods must be made private and other standard methods like dup and clone must be prevented from making copies..
 
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
The Singleton module in the standard library does this work for us.

We just require singleton and then include Singleton into the main class.
 
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
The Singleton module automatically creates the instance class method for us, and we invoke the regular instance method record on that singleton instance.
 
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