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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Performance
# Identifies places where methods are converted to blocks, with the
# use of `&method`, and passed as arguments to method calls.
# It is faster to replace those with explicit blocks, calling those methods inside.
#
# @example
# # bad
# array.map(&method(:do_something))
# [1, 2, 3].each(&out.method(:puts))
#
# # good
# array.map { |x| do_something(x) }
# [1, 2, 3].each { |x| out.puts(x) }
#
class MethodObjectAsBlock < Base
MSG = 'Use block explicitly instead of block-passing a method object.'
def_node_matcher :method_object_as_argument?, <<~PATTERN
(^send (send _ :method sym))
PATTERN
def on_block_pass(node)
add_offense(node) if method_object_as_argument?(node)
end
end
end
end
end
Version data entries
105 entries across 103 versions & 7 rubygems