CODEWITHSUNDEEP
ruby
alex
alex

Reputation: 1

Why is this instance variable 5 instead of 4?

class Node
  attr_accessor :value

  def initialize(value)
    @value
  end
end

class Testo
  attr_accessor :root

  def method
    @root = Node.new(4)
    current = @root
    current.value = 5
  end
end

testing = Testo.new
testing.method
puts testing.root.value #=> Returns 5

I don't understand. Is the local variable current now an instance variable? Is it a copy of @root? Shouldn't root be 4 instead of 5?

Upvotes: 0

Views: 72

Answers (1)

igavriil
igavriil

Reputation: 1021

Variables in Ruby are references to objects.

What you are really doing is instantiating a new Node object with value=4 and then referencing to it with 'current' variable(name) (also @root is referencing the same object) and then changing its value to 5.

Upvotes: 1

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