My personal preference for ruby style

.rubocop.yml

# add indent after access modifier e.g. private
Layout/IndentationConsistency:
  EnforcedStyle: indented_internal_methods # previously rails style

# Use double quotes by default, common in large projects including rails
# https://anti-pattern.com/always-use-double-quoted-strings-in-ruby
Style/StringLiterals:
  Enabled: true
  EnforcedStyle: double_quotes
  
Style/ColonMethodCall:
  Enabled: false

# use %r for long expressions e.g shared_constants acronym_regex
Style/RegexpLiteral:
  Enabled: false

# prefer parens for method calls with args
# exceptions for Gmefile, spec, require, etc. type methods
Style/MethodCallWithArgsParentheses:
  Enabled: true
  IgnoredMethods:
    - expect
    - gem
    - include
    - load
    - require
    - require_relative
    - raise
    - ruby
    - source
    - to
    - to_not
    - not_to
    - be
    - eq
    - have_title
    - have_css
    - have_xpath
    - match

# don't like .zero? instead of == 0
Style/NumericPredicate:
  Enabled: false
  
# preferred method aliases  
Style/CollectionMethods:
  Enabled: true
  PreferredMethods:
    collect:   map
    collect!:  map!
    inject:    reduce
    detect:    find
    find_all:  select
    # TODO: prefer length / size to count when no args ar present for performance (count O(n), length o(1))
    # https://stackoverflow.com/questions/53480273/are-there-performance-reasons-to-prefer-size-over-length-or-count-in-ruby