Flowdock
instance_variable_defined?(p1) public

Returns true if the given instance variable is defined in obj.

   class Fred
     def initialize(p1, p2)
       @a, @b = p1, p2
     end
   end
   fred = Fred.new('cat', 99)
   fred.instance_variable_defined?(:@a)    #=> true
   fred.instance_variable_defined?("@b")   #=> true
   fred.instance_variable_defined?("@c")   #=> false
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