class RuboCop::Cop::Performance::SelectMap
In Ruby 2.7, `Enumerable#filter_map` has been added.
This cop identifies places where `select.map` can be replaced by `filter_map`.
@example
# bad ary.select(&:foo).map(&:bar) ary.filter(&:foo).map(&:bar) # good ary.filter_map { |o| o.bar if o.foo }
Constants
- MSG
- RESTRICT_ON_SEND
Public Instance Methods
on_send(node)
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# File lib/rubocop/cop/performance/select_map.rb, line 31 def on_send(node) return if (first_argument = node.first_argument) && !first_argument.block_pass_type? return unless (send_node = map_method_candidate(node)) return unless send_node.method?(:map) map_method = send_node.parent&.block_type? ? send_node.parent : send_node range = offense_range(node, map_method) add_offense(range, message: format(MSG, method_name: node.method_name)) end
Private Instance Methods
map_method_candidate(node)
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# File lib/rubocop/cop/performance/select_map.rb, line 44 def map_method_candidate(node) return unless (parent = node.parent) if parent.block_type? && parent.parent&.send_type? parent.parent elsif parent.send_type? parent end end
offense_range(node, map_method)
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# File lib/rubocop/cop/performance/select_map.rb, line 54 def offense_range(node, map_method) range_between(node.loc.selector.begin_pos, map_method.loc.expression.end_pos) end