Class: RuboCop::Cop::Style::ArrayJoin

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Defined in:
lib/rubocop/cop/style/array_join.rb

Overview

Checks for uses of “*” as a substitute for join.

Not all cases can reliably checked, due to Ruby’s dynamic types, so we consider only cases when the first argument is an array literal or the second is a string literal.

Examples:


# bad
%w(foo bar baz) * ","

# good
%w(foo bar baz).join(",")

Constant Summary collapse

MSG = 
'Favor `Array#join` over `Array#*`.'
RESTRICT_ON_SEND = 
%i[*].freeze

Instance Method Summary collapse

Methods included from AutoCorrector

support_autocorrect?

Instance Method Details

#join_candidate?(node) ⇒ Object 



27
 
# File 'lib/rubocop/cop/style/array_join.rb', line 27

def_node_matcher :join_candidate?, '(send $array :* $str)'

#on_send(node) ⇒ Object 



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# File 'lib/rubocop/cop/style/array_join.rb', line 29

def on_send(node)
  return unless (array, join_arg = join_candidate?(node))

  add_offense(node.loc.selector) do |corrector|
    corrector.replace(node, "#{array.source}.join(#{join_arg.source})")
  end
end