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Contents
# encoding: utf-8
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 (`!!`).'
def on_send(node)
return unless not_node?(node)
receiver, _method_name, *_args = *node
add_offense(node, :selector) if not_node?(receiver)
end
private
def not_node?(node)
_receiver, method_name, *args = *node
# ! does not take any arguments
args.empty? && method_name == :! &&
node.loc.selector.is?('!')
end
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems