class RuboCop::Cop::Style::For
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.
@example EnforcedStyle: each (default)
# bad def foo for n in [1, 2, 3] do puts n end end # good def foo [1, 2, 3].each do |n| puts n end end
@example EnforcedStyle: for
# bad def foo [1, 2, 3].each do |n| puts n end end # good def foo for n in [1, 2, 3] do puts n end end
Constants
- EACH_LENGTH
- PREFER_EACH
- PREFER_FOR
Public Instance Methods
autocorrect(node)
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# File lib/rubocop/cop/style/for.rb, line 71 def autocorrect(node) if style == :each ForToEachCorrector.new(node) else EachToForCorrector.new(node) end end
on_block(node)
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# File lib/rubocop/cop/style/for.rb, line 59 def on_block(node) return unless suspect_enumerable?(node) if style == :for add_offense(node, message: PREFER_FOR) do opposite_style_detected end else correct_style_detected end end
on_for(node)
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# File lib/rubocop/cop/style/for.rb, line 49 def on_for(node) if style == :each add_offense(node, message: PREFER_EACH) do opposite_style_detected end else correct_style_detected end end
Private Instance Methods
suspect_enumerable?(node)
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# File lib/rubocop/cop/style/for.rb, line 81 def suspect_enumerable?(node) node.multiline? && node.send_node.method?(:each) && !node.send_node.arguments? end