apeiros

// Ruby 2.3.1
/* eval.c:1614:    */ rb_define_virtual_variable("$@", errat_getter, errat_setter);
/* eval.c:1615:    */ rb_define_virtual_variable("$!", errinfo_getter, 0);
/* io.c:12280:     */ rb_define_virtual_variable("$_", rb_lastline_get, rb_lastline_set);
/* load.c:1195:    */ rb_define_virtual_variable("$\"", get_loaded_features, 0);
/* load.c:1196:    */ rb_define_virtual_variable("$LOADED_FEATURES", get_loaded_features, 0);
/* process.c:7537: */ rb_define_virtual_variable("$?", rb_last_status_get, 0);
/* process.c:7538: */ rb_define_virtual_variable("$$", get_pid, 0);
/* re.c:3653:      */ rb_define_virtual_variable("$~", match_getter, match_setter);
/* re.c:3654:      */ rb_define_virtual_variable("$&", last_match_getter, 0);

apeiros

class Temperature
  KelvinToCelsius    = 273.15
  KelvinToFahrenheit = 459.67
  FahrenheitFactor   = 5.0/9

  def self.from_kelvin(kelvin) # could just alias
    new(k: kelvin)
  end

  def self.from_celsius(celsius) # IMO should be just named "celsius"

apeiros

this is afaik mostly for assignment methods. e.g. `a.foo ||= b` expanding to `a.foo = a.foo || b`
would invoke foo= regardless of whether it's necessary. `a.foo || a.foo = b` would not.

apeiros

module Test::Unit::Assertions
  def assert_unordered_equal(expected, actual, message=nil)
    full_message = build_message(message, "<?> expected but was\n<?>.\n", expected, actual)
    assert_block(full_message) {
      seen = Hash.new(0)
      expected.each { |e| seen[e] += 1 }
      actual.each { |e| seen[e] -= 1 }
      seen.invert.keys == [0]
    }
  end

apeiros

class Array
  def split(*separator, include_separator: false)
    if separator.empty?
      if !block_given?
        return enum_for(__method__) if separator.empty? && !block_given?
      end
    elsif block_given?
      raise ArgumentError, "Must either pass a block or a separator, not both"
    else
      separator = separator.first

apeiros

# Encoding:         UTF-8
# Column-Separator: |
# Record-Separator: auto

# Name:    items
# Headers: true
ID | Name  | Price   | Inventory
 1 | Watch |   2.99$ | 50
 2 | Table | 119.99$ | 12
 3 | Chair |  49.99$ | 19

apeiros

# Same result for the same IBM437 character - whether it's utf-8 or IBM437 encoded at input
JSON.parse(JSON.dump(["\u2561".encode('IBM437')])).first.unpack("U*") # => [9569]
JSON.parse(JSON.dump(["\u2561"])).first.unpack("U*") # => [9569]

apeiros

Encoding:         UTF-8
Column-Separator: 7c
Record-Separator: 0a

Name:    items
Headers: true

"ID" | "Name"    | "Price"  | "Inventory"
   1 |   "Watch" |     2.99 | 50
   2 |   "Table" |   119.99 | 12

apeiros

module LayoutHelper
  ActionMapping   = {
    'create' => 'new',
    'update' => 'edit',
  }

private

  def rendered_action
    @_rendered_action ||= begin

apeiros

module Enumerable
  def compacting
    return enum_for(__method__) unless block_given?

    result = []

    each do |value|
      next if value.nil?
      result << value
      yield(value)