class RuboCop::Cop::Performance::RedundantMatch
This cop identifies the use of `Regexp#match` or `String#match`, which returns `#<MatchData>`/`nil`. The return value of `=~` is an integral index/`nil` and is more performant.
@example
# bad do_something if str.match(/regex/) while regex.match('str') do_something end # good method(str =~ /regex/) return value unless regex =~ 'str'
Constants
- MSG
- RESTRICT_ON_SEND
Public Instance Methods
on_send(node)
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# File lib/rubocop/cop/performance/redundant_match.rb, line 38 def on_send(node) return unless match_call?(node) && (!node.value_used? || only_truthiness_matters?(node)) && !(node.parent && node.parent.block_type?) add_offense(node) do |corrector| autocorrect(corrector, node) end end
Private Instance Methods
autocorrect(corrector, node)
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# File lib/rubocop/cop/performance/redundant_match.rb, line 50 def autocorrect(corrector, node) # Regexp#match can take a second argument, but this cop doesn't # register an offense in that case return unless node.first_argument.regexp_type? new_source = "#{node.receiver.source} =~ #{node.first_argument.source}" corrector.replace(node.source_range, new_source) end