This cop looks for uses of the for keyword, or each method. The preferred alternative is set in the EnforcedStyle configuration parameter. An each call with a block on a single line is always allowed, however.
# File lib/rubocop/cop/style/for.rb, line 22 def on_block(node) return if block_length(node) == 0 method, _args, _body = *node return unless method.type == :send _receiver, method_name, *args = *method return unless method_name == :each && args.empty? if style == :for end_pos = method.loc.expression.end_pos range = Parser::Source::Range.new(processed_source.buffer, end_pos - 'each'.length, end_pos) add_offense(range, range, 'Prefer `for` over `each`.') do opposite_style_detected end else correct_style_detected end end
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