class RuboCop::Cop::Lint::DuplicateCaseCondition

Checks that there are no repeated conditions used in case ‘when’ expressions.

@example

# bad

case x
when 'first'
  do_something
when 'first'
  do_something_else
end

@example

# good

case x
when 'first'
  do_something
when 'second'
  do_something_else
end

Constants

MSG

Public Instance Methods

on_case(case_node) click to toggle source
# File lib/rubocop/cop/lint/duplicate_case_condition.rb, line 33
def on_case(case_node)
  case_node.when_branches.each_with_object(Set.new) do |when_node, previous|
    when_node.each_condition do |condition|
      add_offense(condition) unless previous.add?(condition)
    end
  end
end