Object Identity

Two objects can store equal values while still being separate object instances.

object_identity.rb

class Badge
  attr_reader :name

  def initialize(name)
    @name = name
  end

  def ==(other)
    other.is_a?(Badge) && name == other.name
  end
end

other_name = 

first = Badge.new("Ada")
second = Badge.new(other_name)

puts "first=#{first.name}"
puts "second=#{second.name}"
puts "same_object=#{first.equal?(second)}"
puts "same_value=#{first == second}"

class Badge
  attr_reader :name

  def initialize(name)
    @name = name
  end

  def ==(other)
    other.is_a?(Badge) && name == other.name
  end
end

other_name = 

first = Badge.new("Ada")
second = Badge.new(other_name)

puts "first=#{first.name}"
puts "second=#{second.name}"
puts "same_object=#{first.equal?(second)}"
puts "same_value=#{first == second}"

class Badge
  attr_reader :name

  def initialize(name)
    @name = name
  end

  def ==(other)
    other.is_a?(Badge) && name == other.name
  end
end

other_name = 

first = Badge.new("Ada")
second = Badge.new(other_name)

puts "first=#{first.name}"
puts "second=#{second.name}"
puts "same_object=#{first.equal?(second)}"
puts "same_value=#{first == second}"

object identity `equal?` checks whether two variables point to the same object; `==` can compare object values.