The comment that goes with the code says 
### install get/set accessors for this object.

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http://en.wikipedia.org/wiki/Accessor
In computer science, a mutator method is a method used to control changes to a variable. The mutator method, sometimes called a "setter", is most often used in object-oriented programming, in keeping with the principle of encapsulation. ... getters get values, setters set values, understand?

In reply to Re: What is the use of getter and setter by Anonymous Monk
in thread What is the use of getter and setter by lakshmananindia

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