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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# This cop checks for uses of double negation (!!) to convert something
# to a boolean value. As this is both cryptic and usually redundant, it
# should be avoided.
#
# @example
#
# # bad
# !!something
#
# # good
# !something.nil?
#
# Please, note that when something is a boolean value
# !!something and !something.nil? are not the same thing.
# As you're unlikely to write code that can accept values of any type
# this is rarely a problem in practice.
class DoubleNegation < Cop
MSG = 'Avoid the use of double negation (`!!`).'.freeze
def_node_matcher :double_negative?, '(send (send _ :!) :!)'
def on_send(node)
return unless double_negative?(node) && node.prefix_bang?
add_offense(node, location: :selector)
end
end
end
end
end
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