Module: Dieses::Support::Const

Included in:

Dieses

Defined in:

lib/dieses/support/const.rb

Constant Summary

EMPTY_ARRAY =

An empty array

[].freeze

EMPTY_HASH =

An empty hash

{}.freeze

EMPTY_OPTS =

An empty list of options

{}.freeze

EMPTY_SET =

An empty set

::Set.new.freeze

EMPTY_STRING =

An empty string

''

IDENTITY =

Identity function

(->(x) { x }).freeze

Undefined =

rubocop:disable Metrics/BlockLength

Object.new.tap do |undefined| # rubocop:disable Metrics/BlockLength
  const_set(:Self, -> { Undefined })

  def undefined.to_s
    'Undefined'
  end

  def undefined.inspect
    'Undefined'
  end

  def undefined.default(x, y = self)
    if equal?(x)
      if equal?(y)
        yield
      else
        y
      end
    else
      x
    end
  end

  def undefined.map(value)
    if equal?(value)
      self
    else
      yield(value)
    end
  end

  def undefined.dup
    self
  end

  def undefined.clone
    self
  end

  def undefined.coalesce(*args)
    args.find(Self) { |x| !equal?(x) }
  end
end.freeze

Class Method Summary

• .included(base) ⇒ Object

Class Method Details

.included(base) ⇒ Object

# File 'lib/dieses/support/const.rb', line 67

def self.included(base)
  super

  constants.each do |const_name|
    base.const_set(const_name, const_get(const_name))
  end
end