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Size: 944 Bytes
Versions: 14
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Stored size: 944 Bytes
Contents
# encoding: utf-8
# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# This cop checks if each_with_object is called with an immutable
# argument. Since the argument is the object that the given block shall
# make calls on to build something based on the enumerable that
# each_with_object iterates over, an immutable argument makes no sense.
# It's definitely a bug.
#
# @example
#
# sum = numbers.each_with_object(0) { |e, a| a += e }
class EachWithObjectArgument < Cop
MSG = 'The argument to each_with_object can not be immutable.'.freeze
def on_send(node)
_receiver, method_name, *args = *node
return unless method_name == :each_with_object
return unless args.length == 1
arg = args.first
add_offense(node, :expression) if arg.immutable_literal?
end
end
end
end
end
Version data entries
14 entries across 14 versions & 2 rubygems