Layout

# bad
class Plumbus
private
  def smooth; end
end

# good
class Plumbus
  private
  def smooth; end
end

# bad
class Plumbus
  private
  def smooth; end
end

# good
class Plumbus
private
  def smooth; end
end

# good

foo :bar,
    :baz,
    key: value

foo(
  :bar,
  :baz,
  key: value
)

# bad

foo :bar,
  :baz,
  key: value

foo(
  :bar,
    :baz,
    key: value
)

# good

foo :bar,
  :baz,
  key: value

# bad

foo :bar,
    :baz,
    key: value

# good

array = [1, 2, 3,
         4, 5, 6]
array = ['run',
         'forrest',
         'run']

# bad

array = [1, 2, 3,
  4, 5, 6]
array = ['run',
     'forrest',
     'run']

# good

array = [1, 2, 3,
  4, 5, 6]

# bad

array = [1, 2, 3,
         4, 5, 6]

# bad
foo ||= begin
          do_something
        end

# good
foo ||= begin
  do_something
end

# bad
foo ||= begin
  do_something
end

# good
foo ||= begin
          do_something
        end

# bad

foo.bar
  .each do
    baz
      end

# good

foo.bar
  .each do
    baz
end

# bad

foo.bar
  .each do
    baz
      end

# good

foo.bar
  .each do
    baz
  end

# bad

foo.bar
  .each do
    baz
      end

# good

foo.bar
  .each do
    baz
end

# if EndAlignment is set to other style such as
# start_of_line (as shown below), then *when* alignment
# configuration does have an effect.

# bad
a = case n
when 0
  x * 2
else
  y / 3
end

a = case n
in pattern
  x * 2
else
  y / 3
end

# good
a = case n
    when 0
      x * 2
    else
      y / 3
end

a = case n
    in pattern
      x * 2
    else
      y / 3
end

# bad
a = case n
    when 0
      x * 2
    else
      y / 3
end

a = case n
    in pattern
      x * 2
    else
      y / 3
end

# good
a = case n
when 0
  x * 2
else
  y / 3
end

a = case n
in pattern
  x * 2
else
  y / 3
end

# bad
a = 1 # A really long comment
      # spanning two lines.

# good
# A really long comment spanning one line.
a = 1

# good
a = 1 # A really long comment
      # spanning two lines.

# bad

private def foo
            end

# good

private def foo
end

# bad

private def foo
            end

# good

private def foo
        end

# bad
something.
  method

# good
something
  .method

# bad
something
  .method

# good
something.
  method

# good

def foo
end

#################

def bar
end

# bad

def foo
end

#################

def bar
end

# good

#
# Description of `Foo` class.
#
class Foo
end

# bad

#
# Description of `Foo` class.
#
class Foo
end

# checks for empty lines between method definitions.

# bad
def a
end
def b
end

# good
def a
end

def b
end

# checks for empty lines between class definitions.

# bad
class A
end
class B
end
def b
end

# good
class A
end

class B
end

def b
end

# checks for empty lines between module definitions.

# bad
module A
end
module B
end
def b
end

# good
module A
end

module B
end

def b
end

# good
class ErrorA < BaseError; end
class ErrorB < BaseError; end
class ErrorC < BaseError; end

# good
class ErrorA < BaseError; end

class ErrorB < BaseError; end

class ErrorC < BaseError; end

# bad
class ErrorA < BaseError; end
class ErrorB < BaseError; end
class ErrorC < BaseError; end

# good
class ErrorA < BaseError; end

class ErrorB < BaseError; end

class ErrorC < BaseError; end

# bad
class Foo
  def bar; end
  private
  def baz; end
end

# good
class Foo
  def bar; end

  private

  def baz; end
end

# bad
class Foo
  def bar; end
  private
  def baz; end
end

# good
class Foo
  def bar; end

  private
  def baz; end
end

# good
attr_accessor :foo
alias :foo? :foo

def do_something
end

# bad
attr_accessor :foo
alias :foo? :foo

def do_something
end

# good
attr_accessor :foo

alias :foo? :foo

def do_something
end

# good
attr_accessor :foo
private :foo

def do_something
end

# good

foo do |bar|
  # ...
end

# good

foo do |bar|

  # ...

end

# good

class Foo
  def bar
    # ...
  end
end

# good

class Foo

  def bar
    # ...
  end

end

# good

class Foo
  class Bar

    # ...

  end
end

# good
class Foo

  def bar; end

end

# good

class Foo

  def bar
    # ...
  end
end

# good

class Foo
  def bar
    # ...
  end

end

# good

module Foo
  def bar
    # ...
  end
end

# good

module Foo

  def bar
    # ...
  end

end

# good

module Foo
  module Bar

    # ...

  end
end

# good
module Foo

  def bar; end

end

# bad

variable = if true
    end

# good

variable = if true
           end

variable =
  if true
  end

# bad

variable = if true
    end

# good

variable = if true
end

variable =
  if true
  end

# bad

variable = if true
    end

puts(if true
     end)

# good

variable = if true
end

puts(if true
end)

variable =
  if true
  end

# The `native` style means that CR+LF (Carriage Return + Line Feed) is
# enforced on Windows, and LF is enforced on other platforms.

# bad
puts 'Hello' # Return character is LF on Windows.
puts 'Hello' # Return character is CR+LF on other than Windows.

# good
puts 'Hello' # Return character is CR+LF on Windows.
puts 'Hello' # Return character is LF on other than Windows.

# The `lf` style means that LF (Line Feed) is enforced on
# all platforms.

# bad
puts 'Hello' # Return character is CR+LF on all platforms.

# good
puts 'Hello' # Return character is LF on all platforms.

# The `crlf` style means that CR+LF (Carriage Return + Line Feed) is
# enforced on all platforms.

# bad
puts 'Hello' # Return character is LF on all platforms.

# good
puts 'Hello' # Return character is CR+LF on all platforms.

# Same as `special_for_inner_method_call` except that the special rule
# only applies if the outer method call encloses its arguments in
# parentheses.

# good
some_method(
  first_param,
second_param)

foo = some_method(
  first_param,
second_param)

foo = some_method(nested_call(
                    nested_first_param),
second_param)

foo = some_method(
  nested_call(
    nested_first_param),
second_param)

some_method nested_call(
  nested_first_param),
second_param

# The first argument should always be indented one step more than the
# preceding line.

# good
some_method(
  first_param,
second_param)

foo = some_method(
  first_param,
second_param)

foo = some_method(nested_call(
  nested_first_param),
second_param)

foo = some_method(
  nested_call(
    nested_first_param),
second_param)

some_method nested_call(
  nested_first_param),
second_param

# The first argument should always be indented one level relative to
# the parent that is receiving the argument

# good
some_method(
  first_param,
second_param)

foo = some_method(
        first_param,
second_param)

foo = some_method(nested_call(
                    nested_first_param),
second_param)

foo = some_method(
        nested_call(
          nested_first_param),
second_param)

some_method nested_call(
              nested_first_param),
second_params

# The first argument should normally be indented one step more than
# the preceding line, but if it's an argument for a method call that
# is itself an argument in a method call, then the inner argument
# should be indented relative to the inner method.

# good
some_method(
  first_param,
second_param)

foo = some_method(
  first_param,
second_param)

foo = some_method(nested_call(
                    nested_first_param),
second_param)

foo = some_method(
  nested_call(
    nested_first_param),
second_param)

some_method nested_call(
              nested_first_param),
second_param

# The `special_inside_parentheses` style enforces that the first
# element in an array literal where the opening bracket and first
# element are on separate lines is indented one step (two spaces) more
# than the position inside the opening parenthesis.

# bad
array = [
  :value
]
and_in_a_method_call([
  :no_difference
                     ])

# good
array = [
  :value
]
but_in_a_method_call([
                       :its_like_this
                     ])

# The `consistent` style enforces that the first element in an array
# literal where the opening bracket and the first element are on
# separate lines is indented the same as an array literal which is not
# defined inside a method call.

# bad
array = [
  :value
]
but_in_a_method_call([
                       :its_like_this
])

# good
array = [
  :value
]
and_in_a_method_call([
  :no_difference
])

# The `align_brackets` style enforces that the opening and closing
# brackets are indented to the same position.

# bad
and_now_for_something = [
                          :completely_different
]

# good
and_now_for_something = [
                          :completely_different
                        ]

# bad
[ :a, {
  :b => :c
}]

# good
[
  :a, {
  :b => :c
}]

# good
[:a, {
  :b => :c
}]

# The `special_inside_parentheses` style enforces that the first key
# in a hash literal where the opening brace and the first key are on
# separate lines is indented one step (two spaces) more than the
# position inside the opening parentheses.

# bad
hash = {
  key: :value
}
and_in_a_method_call({
  no: :difference
                     })
takes_multi_pairs_hash(x: {
  a: 1,
  b: 2
},
                       y: {
                         c: 1,
                         d: 2
                       })

# good
special_inside_parentheses
hash = {
  key: :value
}
but_in_a_method_call({
                       its_like: :this
                     })
takes_multi_pairs_hash(x: {
                         a: 1,
                         b: 2
                       },
                       y: {
                         c: 1,
                         d: 2
                       })

# The `consistent` style enforces that the first key in a hash
# literal where the opening brace and the first key are on
# separate lines is indented the same as a hash literal which is not
# defined inside a method call.

# bad
hash = {
  key: :value
}
but_in_a_method_call({
                       its_like: :this
                      })

# good
hash = {
  key: :value
}
and_in_a_method_call({
  no: :difference
})

# The `align_brackets` style enforces that the opening and closing
# braces are indented to the same position.

# bad
and_now_for_something = {
                          completely: :different
}
takes_multi_pairs_hash(x: {
  a: 1,
  b: 2
},
                        y: {
                             c: 1,
                             d: 2
                           })

# good
and_now_for_something = {
                          completely: :different
                        }
takes_multi_pairs_hash(x: {
                            a: 1,
                            b: 2
                          },
                       y: {
                            c: 1,
                            d: 2
                          })

# bad
{ a: 1, b: {
  c: 3
}}

# bad
{ a: 1,
  b: {
  c: 3
}}

# good
{ a: 1, b: {
  c: 3
}}

# bad
method(foo, bar, {
  baz: "a",
  qux: "b",
})

# good
method(
  foo, bar, {
  baz: "a",
  qux: "b",
})

# bad
method(foo,
  bar,
  {
    baz: "a",
    qux: "b",
  }
)

# good
method(foo, bar, {
  baz: "a",
  qux: "b",
})

# good
method(
  foo,
  bar,
  {
    baz: "a",
    qux: "b",
  }
)

# good
some_method(foo, bar,
  baz)

# bad
def method(foo, bar, baz = {
  :a => "b",
})
  do_something
end

# good
def method(
  foo, bar, baz = {
  :a => "b",
})
  do_something
end

# good
def method(foo, bar, baz = {
  :a => "b",
})
  do_something
end

# The first parameter should always be indented one step more than the
# preceding line.

# good
def some_method(
  first_param,
second_param)
  123
end

# The first parameter should always be indented one step more than the
# opening parenthesis.

# good
def some_method(
                 first_param,
second_param)
  123
end

# bad
{
  :foo => bar,
   :ba => baz
}
{
  :foo => bar,
  :ba  => baz
}

# good
{
  :foo => bar,
  :ba => baz
}

# bad
{
  :foo => bar,
  :ba => baz
}
{
  :foo => bar,
  :ba  => baz
}

# good
{
  :foo => bar,
   :ba => baz
}

# bad
{
  :foo => bar,
   :ba => baz
}

# good
{
  :foo => bar,
  :ba  => baz
}

# bad
{
  foo: bar,
   ba: baz
}
{
  foo: bar,
  ba:  baz
}

# good
{
  foo: bar,
  ba: baz
}

# bad
{
  foo: bar,
  ba: baz
}

# good
{
  foo: bar,
   ba: baz
}

# bad
{
  foo: bar,
  ba: baz
}

# good
{
  foo: bar,
  ba:  baz
}

# Inspect both implicit and explicit hashes.

# bad
do_something(foo: 1,
  bar: 2)

# bad
do_something({foo: 1,
  bar: 2})

# good
do_something(foo: 1,
             bar: 2)

# good
do_something(
  foo: 1,
  bar: 2
)

# good
do_something({foo: 1,
              bar: 2})

# good
do_something({
  foo: 1,
  bar: 2
})

# Ignore both implicit and explicit hashes.

# good
do_something(foo: 1,
  bar: 2)

# good
do_something({foo: 1,
  bar: 2})

# Ignore only implicit hashes.

# bad
do_something({foo: 1,
  bar: 2})

# good
do_something(foo: 1,
  bar: 2)

# Ignore only explicit hashes.

# bad
do_something(foo: 1,
  bar: 2)

# good
do_something({foo: 1,
  bar: 2})

# bad
class A
  def test
    puts 'hello'
     puts 'world'
  end
end

# bad
class A
  def test
    puts 'hello'
    puts 'world'
  end

  protected

    def foo
    end

  private

    def bar
    end
end

# good
class A
  def test
    puts 'hello'
    puts 'world'
  end
end

# good
class A
  def test
    puts 'hello'
    puts 'world'
  end

  protected

  def foo
  end

  private

  def bar
  end
end

# bad
class A
  def test
    puts 'hello'
     puts 'world'
  end
end

# bad
class A
  def test
    puts 'hello'
    puts 'world'
  end

  protected

  def foo
  end

  private

  def bar
  end
end

# good
class A
  def test
    puts 'hello'
    puts 'world'
  end
end

# good
class A
  def test
    puts 'hello'
    puts 'world'
  end

  protected

    def foo
    end

  private

    def bar
    end
end

# bad
# This example uses a tab to indent bar.
def foo
  bar
end

# good
# This example uses spaces to indent bar.
def foo
  bar
end

# bad
# This example uses spaces to indent bar.
def foo
  bar
end

# good
# This example uses a tab to indent bar.
def foo
  bar
end

# bad
class A
 def test
  puts 'hello'
 end
end

# good
class A
  def test
    puts 'hello'
  end
end

# bad
module A
class B
  def test
  puts 'hello'
  end
end
end

# good
module A
class B
  def test
    puts 'hello'
  end
end
end

# bad

#**
# Some comment
# Another line of comment
#*

# good

#**
# Some comment
# Another line of comment
#*

# bad

#ruby=2.7.0
#ruby-gemset=myproject

# good

#ruby=2.7.0
#ruby-gemset=myproject

# bad

include Enumerable #[Integer]

attr_reader :name #: String
attr_reader :age  #: Integer?

# good

include Enumerable #[Integer]

attr_reader :name #: String
attr_reader :age  #: Integer?

# bad
[1, 2, 3].each_with_object([]) do |n, list| #$ Array[Integer]
  list << n
end

name = 'John'      #: String

# good

[1, 2, 3].each_with_object([]) do |n, list| #$ Array[Integer]
  list << n
end

name = 'John'      #: String

# bad
'this text contains a lot of' \
'               spaces'

# good
'this text contains a lot of               ' \
'spaces'

# bad
'this text is too' \
' long'

# good
'this text is too ' \
'long'

# bad
'this text contains a lot of               ' \
'spaces'

# good
'this text contains a lot of' \
'               spaces'

# bad
'this text is too ' \
'long'

# good
'this text is too' \
' long'

# bad
'a'\
'b'  \
'c'

# good
'a' \
'b' \
'c'

# bad
'a' \
'b'  \
'c'

# good
'a'\
'b'\
'c'

# bad
puts 'x' \
  'y'

my_hash = {
  first: 'a message' \
    'in two parts'
}

# good
puts 'x' \
     'y'

my_hash = {
  first: 'a message' \
         'in two parts'
}

# bad
result = 'x' \
         'y'

my_hash = {
  first: 'a message' \
         'in two parts'
}

# good
result = 'x' \
  'y'

my_hash = {
  first: 'a message' \
    'in two parts'
}

# bad
[ :a,
  :b
]

# bad
[
  :a,
  :b ]

# good
[ :a,
  :b ]

# good
[
  :a,
  :b
]

# bad
[
  :a,
  :b ]

# bad
[ :a,
  :b ]

# good
[ :a,
  :b
]

# good
[
  :a,
  :b
]

# bad
[ :a,
  :b
]

# bad
[
  :a,
  :b
]

# good
[
  :a,
  :b ]

# good
[ :a,
  :b ]

# bad
[a, b, foo(
  bar
)]

# good
[a, b, foo(
  bar
)]

# bad
foo = if expression
  'bar'
end

# good
foo =
  if expression
    'bar'
  end

# good
foo =
  begin
    compute
  rescue => e
    nil
  end

# good
foo = if expression
  'bar'
end

# good
foo =
  if expression
    'bar'
  end

# good
foo =
  [1].map do |i|
    i + 1
  end

# good
foo = if expression
  'bar'
end

# good
foo =
  [1].map do |i|
    'bar' * i
  end

# bad
{ a: 1,
  b: 2
}
# bad
{
  a: 1,
  b: 2 }

# good
{ a: 1,
  b: 2 }

# good
{
  a: 1,
  b: 2
}

# bad
{
  a: 1,
  b: 2 }

# bad
{ a: 1,
  b: 2 }

# good
{ a: 1,
  b: 2
}

# good
{
  a: 1,
  b: 2
}

# bad
{ a: 1,
  b: 2
}

# bad
{
  a: 1,
  b: 2
}

# good
{
  a: 1,
  b: 2 }

# good
{ a: 1,
  b: 2 }

# bad
{ a: 1, b: {
  c: 3,
}}

# good
{ a: 1, b: {
  c: 3,
}}

# good
foo(
  a,
  b,
  {
    foo: "bar",
  }
)

# good
foo(
  a,
  b,
  {
    foo: "bar",
  }
)

# bad
foo(a,
  b
)

# bad
foo(
  a,
  b)

# good
foo(a,
  b)

# good
foo(
  a,
  b
)

# bad
foo(
  a,
  b)

# bad
foo(a,
  b)

# good
foo(a,
  b
)

# good
foo(
  a,
  b
)

# bad
foo(a,
  b
)

# bad
foo(
  a,
  b
)

# good
foo(
  a,
  b)

# good
foo(a,
  b)

# bad
while myvariable
.b
  # do something
end

# good
while myvariable
      .b
  # do something
end

# good
Thing.a
     .b
     .c

# good
while myvariable
  .b

  # do something
end

# good
while myvariable
        .a
        .b

  # do something
end

# good
myvariable = Thing
               .a
               .b
               .c

# bad
def foo(a,
  b
)
end

# bad
def foo(
  a,
  b)
end

# good
def foo(a,
  b)
end

# good
def foo(
  a,
  b
)
end

# bad
def foo(
  a,
  b)
end

# bad
def foo(a,
  b)
end

# good
def foo(a,
  b
)
end

# good
def foo(
  a,
  b
)
end

# bad
def foo(a,
  b
)
end

# bad
def foo(
  a,
  b
)
end

# good
def foo(
  a,
  b)
end

# good
def foo(a,
  b)
end

# bad
def foo(a, b = {
  foo: "bar",
})
end

# good
def foo(a, b = {
  foo: "bar",
})
end

# bad
if a +
    b
  something &&
  something_else
end

# good
if a +
   b
  something &&
    something_else
end

# bad
if a +
   b
  something &&
  something_else
end

# good
if a +
    b
  something &&
    something_else
end

# good

def foo(bar,
        baz)
  123
end

def foo(
  bar,
  baz
)
  123
end

# bad

def foo(bar,
     baz)
  123
end

# bad

def foo(
  bar,
     baz)
  123
end

# good

def foo(bar,
  baz)
  123
end

def foo(
  bar,
  baz
)
  123
end

# bad

def foo(bar,
        baz)
  123
end

# bad

def foo(
  bar,
     baz)
  123
end

# bad
foo(
  a,
  b
)

puts 'string that fits on ' \
     'a single line'

things
  .select { |thing| thing.cond? }
  .join('-')

# good
foo(a, b)

puts 'string that fits on a single line'

things.select { |thing| thing.cond? }.join('-')

# good
foo(a) do |x|
  puts x
end

# bad
foo(a) do |x|
  puts x
end

# good
foo(a) { |x| puts x }

# bad
{}.each { | x,  y |puts x }
->( x,  y ) { puts x }

# good
{}.each { |x, y| puts x }
->(x, y) { puts x }

# bad
{}.each { |x,  y| puts x }
->(x,  y) { puts x }

# good
{}.each { | x, y | puts x }
->( x, y ) { puts x }

# bad
def some_method(arg1=:default, arg2=nil, arg3=[])
  # do something...
end

# good
def some_method(arg1 = :default, arg2 = nil, arg3 = [])
  # do something...
end

# bad
def some_method(arg1 = :default, arg2 = nil, arg3 = [])
  # do something...
end

# good
def some_method(arg1=:default, arg2=nil, arg3=[])
  # do something...
end

# good
{
  1 =>  2,
  11 => 3
}

# bad
{
  1 =>  2,
  11 => 3
}

# bad
a ** b

# good
a**b

# bad
a**b

# good
a ** b

# bad
1 / 48r

# good
1/48r

# bad
1/48r

# good
1 / 48r

# bad
foo.map{ |a|
  a.bar.to_s
}

# good
foo.map { |a|
  a.bar.to_s
}

# bad
foo.map { |a|
  a.bar.to_s
}

# good
foo.map{ |a|
  a.bar.to_s
}

# bad
7.times{}

# good
7.times {}

# bad
7.times {}

# good
7.times{}

# bad
a = -> (x, y) { x + y }

# good
a = ->(x, y) { x + y }

# bad
a = ->(x, y) { x + y }

# good
a = -> (x, y) { x + y }

# The `no_space` style enforces that array literals have
# no surrounding space.

# bad
array = [ a, b, c, d ]

# good
array = [a, b, c, d]

# The `space` style enforces that array literals have
# surrounding space.

# bad
array = [a, b, c, d]

# good
array = [ a, b, c, d ]

# The `compact` style normally requires a space inside
# array brackets, with the exception that successive left
# or right brackets are collapsed together in nested arrays.

# bad
array = [ a, [ b, c ] ]
array = [
  [ a ],
  [ b, c ]
]

# good
array = [ a, [ b, c ]]
array = [[ a ],
  [ b, c ]]

# The `no_space` EnforcedStyleForEmptyBrackets style enforces that
# empty array brackets do not contain spaces.

# bad
foo = [ ]
bar = [     ]

# good
foo = []
bar = []

# The `space` EnforcedStyleForEmptyBrackets style enforces that
# empty array brackets contain exactly one space.

# bad
foo = []
bar = [    ]

# good
foo = [ ]
bar = [ ]

# The `space` style enforces that block braces have
# surrounding space.

# bad
some_array.each {puts e}

# good
some_array.each { puts e }

# The `no_space` style enforces that block braces don't
# have surrounding space.

# bad
some_array.each { puts e }

# good
some_array.each {puts e}

# The `no_space` EnforcedStyleForEmptyBraces style enforces that
# block braces don't have a space in between when empty.

# bad
some_array.each {   }
some_array.each {  }
some_array.each { }

# good
some_array.each {}

# The `space` EnforcedStyleForEmptyBraces style enforces that
# block braces have at least a space in between when empty.

# bad
some_array.each {}

# good
some_array.each { }
some_array.each {  }
some_array.each {   }

# The SpaceBeforeBlockParameters style set to `true` enforces that
# there is a space between `{` and `|`. Overrides `EnforcedStyle`
# if there is a conflict.

# bad
[1, 2, 3].each {|n| n * 2 }

# good
[1, 2, 3].each { |n| n * 2 }

# The SpaceBeforeBlockParameters style set to `false` enforces that
# there is no space between `{` and `|`. Overrides `EnforcedStyle`
# if there is a conflict.

# bad
[1, 2, 3].each { |n| n * 2 }

# good
[1, 2, 3].each {|n| n * 2 }

# The `space` style enforces that hash literals have
# surrounding space.

# bad
h = {a: 1, b: 2}

# good
h = { a: 1, b: 2 }

# The `no_space` style enforces that hash literals have
# no surrounding space.

# bad
h = { a: 1, b: 2 }

# good
h = {a: 1, b: 2}

# The `compact` style normally requires a space inside
# hash braces, with the exception that successive left
# braces or right braces are collapsed together in nested hashes.

# bad
h = { a: { b: 2 } }
foo = { { a: 1 } => { b: { c: 2 } } }

# good
h = { a: { b: 2 }}
foo = {{ a: 1 } => { b: { c: 2 }}}

# The `no_space` EnforcedStyleForEmptyBraces style enforces that
# empty hash braces do not contain spaces.

# bad
foo = { }
bar = {    }
baz = {
}

# good
foo = {}
bar = {}
baz = {}

# The `space` EnforcedStyleForEmptyBraces style enforces that
# empty hash braces contain space.

# bad
foo = {}

# good
foo = { }
foo = {    }
foo = {
}

# The `no_space` style enforces that parentheses do not have spaces.

# bad
f( 3)
g = (a + 3 )
f( )

# good
f(3)
g = (a + 3)
f()

# The `space` style enforces that parentheses have a space at the
# beginning and end.
# Note: Empty parentheses should not have spaces.

# bad
f(3)
g = (a + 3)
y( )

# good
f( 3 )
g = ( a + 3 )
y()

# The `compact` style enforces that parentheses have a space at the
# beginning with the exception that successive parentheses are allowed.
# Note: Empty parentheses should not have spaces.

# bad
f(3)
g = (a + 3)
y( )
g( f( x ) )
g( f( x( 3 ) ), 5 )
g( ( ( 3 + 5 ) * f) ** x, 5 )

# good
f( 3 )
g = ( a + 3 )
y()
g( f( x ))
g( f( x( 3 )), 5 )
g((( 3 + 5 ) * f ) ** x, 5 )

# The `no_space` style enforces that reference brackets have
# no surrounding space.

# bad
hash[ :key ]
array[ index ]

# good
hash[:key]
array[index]

# The `space` style enforces that reference brackets have
# surrounding space.

# bad
hash[:key]
array[index]

# good
hash[ :key ]
array[ index ]

# The `no_space` EnforcedStyleForEmptyBrackets style enforces that
# empty reference brackets do not contain spaces.

# bad
foo[ ]
foo[     ]
foo[
]

# good
foo[]

# The `space` EnforcedStyleForEmptyBrackets style enforces that
# empty reference brackets contain exactly one space.

# bad
foo[]
foo[    ]
foo[
]

# good
foo[ ]

# bad
   var = "This is the #{ space } example"

# good
   var = "This is the #{no_space} example"

# bad
   var = "This is the #{no_space} example"

# good
   var = "This is the #{ space } example"

# `final_newline` looks for one newline at the end of files.

# bad
class Foo; end

# EOF

# bad
class Foo; end # EOF

# good
class Foo; end
# EOF

# `final_blank_line` looks for one blank line followed by a new line
# at the end of files.

# bad
class Foo; end
# EOF

# bad
class Foo; end # EOF

# good
class Foo; end

# EOF

# The line in this example contains spaces after the 0.
# bad
code = <<~RUBY
  x = 0
RUBY

# ok
code = <<~RUBY
  x = 0 #{}
RUBY

# good
trailing_whitespace = ' '
code = <<~RUBY
  x = 0#{trailing_whitespace}
RUBY

# The line in this example contains spaces after the 0.
# good
code = <<~RUBY
  x = 0
RUBY