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Versions: 7156
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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# This cop checks for underscore-prefixed variables that are actually
# used.
#
# @example
#
# # bad
#
# [1, 2, 3].each do |_num|
# do_something(_num)
# end
#
# @example
#
# # good
#
# [1, 2, 3].each do |num|
# do_something(num)
# end
#
# @example
#
# # good
#
# [1, 2, 3].each do |_num|
# do_something # not using `_num`
# end
class UnderscorePrefixedVariableName < Cop
MSG = 'Do not use prefix `_` for a variable that is used.'.freeze
def join_force?(force_class)
force_class == VariableForce
end
def after_leaving_scope(scope, _variable_table)
scope.variables.each_value do |variable|
check_variable(variable)
end
end
def check_variable(variable)
return unless variable.should_be_unused?
return if variable.references.none?(&:explicit?)
node = variable.declaration_node
location = if node.match_with_lvasgn_type?
node.children.first.source_range
else
node.loc.name
end
add_offense(nil, location: location)
end
end
end
end
end
Version data entries
7,156 entries across 7,150 versions & 27 rubygems