Byte4/acebook-byte4

Use a guard clause instead of wrapping the code inside a conditional expression

Example:

# bad
def test
  if something
    work
  end
end
 
# good
def test
  return unless something
  work
end
 
# also good
def test
  work if something
end
 
# bad
if something
  raise 'exception'
else
  ok
end
 
# good
raise 'exception' if something
ok

Checks that block braces have or don't have surrounding space inside them on configuration. For blocks taking parameters, it checks that the left brace has or doesn't have trailing space depending on configuration.

Example: EnforcedStyle: space (default)

# The `space` style enforces that block braces have
# surrounding space.
 
# bad
some_array.each {puts e}
 
# good
some_array.each { puts e }

Example: EnforcedStyle: no_space

# 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}

Example: EnforcedStyleForEmptyBraces: no_space (default)

# 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 {}

Example: EnforcedStyleForEmptyBraces: space

# The `space` EnforcedStyleForEmptyBraces style enforces that
# block braces have at least a spece in between when empty.
 
# bad
some_array.each {}
 
# good
some_array.each { }
some_array.each {  }
some_array.each {   }

Example: SpaceBeforeBlockParameters: true (default)

# 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 }

Example: SpaceBeforeBlockParameters: true

# 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 }

This cop checks for missing top-level documentation of classes and modules. Classes with no body are exempt from the check and so are namespace modules - modules that have nothing in their bodies except classes, other modules, or constant definitions.

The documentation requirement is annulled if the class or module has a "#:nodoc:" comment next to it. Likewise, "#:nodoc: all" does the same for all its children.

Example:

# bad
class Person
  # ...
end
 
# good
# Description/Explanation of Person class
class Person
  # ...
end

This cops checks if empty lines around the bodies of classes match the configuration.

Example: EnforcedStyle: empty_lines

# good
 
class Foo
 
  def bar
    # ...
  end
 
end

Example: EnforcedStyle: emptylinesexcept_namespace

# good
 
class Foo
  class Bar
 
    # ...
 
  end
end

Example: EnforcedStyle: emptylinesspecial

# good
class Foo
 
  def bar; end
 
end

Example: EnforcedStyle: noemptylines (default)

# good
 
class Foo
  def bar
    # ...
  end
end

This cops checks if empty lines around the bodies of classes match the configuration.

Example: EnforcedStyle: empty_lines

# good
 
class Foo
 
  def bar
    # ...
  end
 
end

Example: EnforcedStyle: emptylinesexcept_namespace

# good
 
class Foo
  class Bar
 
    # ...
 
  end
end

Example: EnforcedStyle: emptylinesspecial

# good
class Foo
 
  def bar; end
 
end

Example: EnforcedStyle: noemptylines (default)

# good
 
class Foo
  def bar
    # ...
  end
end

This cop is designed to help upgrade to Ruby 3.0. It will add the comment # frozen_string_literal: true to the top of files to enable frozen string literals. Frozen string literals may be default in Ruby 3.0. The comment will be added below a shebang and encoding comment. The frozen string literal comment is only valid in Ruby 2.3+.

Example: EnforcedStyle: when_needed (default)

# The `when_needed` style will add the frozen string literal comment
# to files only when the `TargetRubyVersion` is set to 2.3+.
# bad
module Foo
  # ...
end
 
# good
# frozen_string_literal: true
 
module Foo
  # ...
end

Example: EnforcedStyle: always

# The `always` style will always add the frozen string literal comment
# to a file, regardless of the Ruby version or if `freeze` or `<<` are
# called on a string literal.
# bad
module Bar
  # ...
end
 
# good
# frozen_string_literal: true
 
module Bar
  # ...
end

Example: EnforcedStyle: never

# The `never` will enforce that the frozen string literal comment does
# not exist in a file.
# bad
# frozen_string_literal: true
 
module Baz
  # ...
end
 
# good
module Baz
  # ...
end