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Contents
# encoding: utf-8
# frozen_string_literal: true
module RuboCop
module Cop
module Performance
# This cop is used to identify usages of
#
# @example
# # bad
# [].push(*a)
#
# # good
# [].concat(a)
class PushSplat < Cop
include Parentheses
MSG = 'Use `concat` instead of `push(*)`.'.freeze
def_node_matcher :push_splat, <<-END
(send _ :push (splat ...))
END
def on_send(node)
push_splat(node) do
add_offense(node, :expression, MSG)
end
end
def autocorrect(node)
_receiver, _method, splat = *node
body, = *splat
lambda do |corrector|
corrector.replace(node.location.selector, 'concat')
source = if parens_required?(splat)
"(#{body.source})"
else
body.source
end
corrector.replace(splat.loc.expression, source)
end
end
end
end
end
end
Version data entries
6 entries across 6 versions & 2 rubygems