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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Lint
#
# Prefer `equal?` over `==` when comparing `object_id`.
#
# `Object#equal?` is provided to compare objects for identity, and in contrast
# `Object#==` is provided for the purpose of doing value comparison.
#
# @example
# # bad
# foo.object_id == bar.object_id
#
# # good
# foo.equal?(bar)
#
class IdentityComparison < Base
extend AutoCorrector
MSG = 'Use `equal?` instead `==` when comparing `object_id`.'
RESTRICT_ON_SEND = %i[==].freeze
def on_send(node)
return unless compare_between_object_id_by_double_equal?(node)
add_offense(node) do |corrector|
receiver = node.receiver.receiver
argument = node.first_argument.receiver
return unless receiver && argument
replacement = "#{receiver.source}.equal?(#{argument.source})"
corrector.replace(node, replacement)
end
end
private
def compare_between_object_id_by_double_equal?(node)
object_id_method?(node.receiver) && object_id_method?(node.first_argument)
end
def object_id_method?(node)
node.send_type? && node.method?(:object_id)
end
end
end
end
end
Version data entries
117 entries across 111 versions & 11 rubygems