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Re:Ruby basics (1 viewing) (1) Guest
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TOPIC: Re:Ruby basics
#4373
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Instance Variables:

Instance variables are available across methods for any particular instance or object.

That means that instance variables change from object to object. In

stance variables are preceded by the at sign (@) followed by the variable name.
 
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#4374
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Class Variables:

Class variables are available across different objects.

A class variable belongs to the class and is a characteristic of a class.

They are preceded by the sign @@ and are followed by the variable name
 
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#4375
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Global Variables:

Class variables are not available across classes.

If we want to have a single variable, which is available across classes, we need to define a global variable

. The global variables are always preceded by the dollar sign ($).
 
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#4376
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Let's consider an example

Using the class variable @@no_of_customers, we can determine the number of objects that are being created.

This enables in deriving the number of customers.

class Customer
@@no_of_customers=0
end
 
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#4377
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Objects are instances of the class. .

We can create objects in Ruby by using the method new of the class.
 
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ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
The method new is a unique type of method, which is predefined in the Ruby library.

The new method belongs to the class methods.
 
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