Sha256: 50d6e3354bd8681f3f34b261cee35477a08938a3690cfe83e35aca1809a9286c
Contents?: true
Size: 1.24 KB
Versions: 6
Compression:
Stored size: 1.24 KB
Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# This cop checks for lambdas that always return nil, which can be replaced
# with an empty lambda instead.
#
# @example
# # bad
# -> { nil }
#
# lambda do
# next nil
# end
#
# # good
# -> {}
#
# lambda do
# end
#
# -> (x) { nil if x }
#
class NilLambda < Base
extend AutoCorrector
include RangeHelp
MSG = 'Use an empty lambda instead of always returning nil.'
# @!method nil_return?(node)
def_node_matcher :nil_return?, <<~PATTERN
{ ({return next break} nil) (nil) }
PATTERN
def on_block(node)
return unless node.lambda?
return unless nil_return?(node.body)
add_offense(node) do |corrector|
range = if node.single_line?
range_with_surrounding_space(range: node.body.loc.expression)
else
range_by_whole_lines(node.body.loc.expression, include_final_newline: true)
end
corrector.remove(range)
end
end
end
end
end
end
Version data entries
6 entries across 6 versions & 2 rubygems