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Contents
require 'set'
module Dry
module Core
# A list of constants you can use to avoid memory allocations or identity checks.
#
# @example Just include this module to your class or module
# class Foo
# def call(value = EMPTY_ARRAY)
# value.map(&:to_s)
# end
# end
#
# @api public
module Constants
# An empty array
EMPTY_ARRAY = [].freeze
# An empty hash
EMPTY_HASH = {}.freeze
# An empty list of options
EMPTY_OPTS = {}.freeze
# An empty set
EMPTY_SET = Set.new.freeze
# An empty string
EMPTY_STRING = ''.freeze
# A special value you can use as a default to know if no arguments
# were passed to you method
#
# @example
# def method(value = Undefined)
# if value == Undefined
# puts 'no args'
# else
# puts value
# end
# end
Undefined = Object.new.tap do |undefined|
def undefined.to_s
'Undefined'
end
def undefined.inspect
'Undefined'
end
end.freeze
def self.included(base)
super
constants.each do |const_name|
base.const_set(const_name, const_get(const_name))
end
end
end
end
end
Version data entries
13 entries across 13 versions & 1 rubygems