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Ruby On Rails Interview Questions and Answers

Answer:

Instance variables are defined using single @ symbol.

@foo = "Hello"

Within a class they can be declared as below:

class Animal
 attr_accessor :name, :age
end

Next you can query an object instance to find which instance variables it has.

anim = Animal.new
anim.instance_variables 
=> [ ]
anim.name="John"
anim.age = 3
 => [:@age, :@name]

In the above case we did not put the @ symbol before the instance variables but it is implied.

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