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# Add factorial method to Math standard module in Ruby
module Factorial
  def factorial(n)
    Integer Math.gamma(n.to_i + 1)
  end
end

Math.extend Factorial

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ActiveSupport::Inflector.inflections(:en) do |inflect|
  inflect.plural('human', 'humans')
  inflect.plural('cayman', 'caymans')
end

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# CAUTION, it opens String class
String.class_eval do
  # HACK: quick and dirty english pluralization.
  def to_plural(*arg)
    plural = lambda do |str|
      if str =~ /\s\z|men\z|people\z|[^aious]s\z/i # is a plural already
        str
      elsif str =~ /\Aman\z|woman\z/i # man & woman, except caiman, human...
        str.sub(/an\z/i, 'en')
      elsif str =~ /[^aeiou][aeiou]?(f|fe)\z/ # knife, half...

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// Number.formatISOAPA returns a correctly SI+APA formatted number.
// (SI, System Internationale) ISO 31-0 & APA style EXPLANATION:
// <https://en.wikipedia.org/wiki/ISO_31-0#Numbers>
// ISO 31-0: The decimal sign is either the comma on the line 
//           or the point on the line. Both "1,33" & "1.33" are valid.
// ISO 31-0: Do not use "." nor "," for thousand separators.
//           Both "1,000.00" "1.000,00" are INVALID.
// ISO 31-0: For numbers whose magnitude is less than 1, the decimal
//           sign should be preceded by a zero. "0.5" instead of ".5"
// APA style: Psychologically, there is no need to group numbers with 

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# Countdown class is for making countdown ranges without reversing.
# a = Countdown.new 5
# b = Countdown.new 1
# print (a..b).map(&:value).join(', ') # => 
#   5, 4, 3, 2, 1 => nil
class Countdown
  VERSION = 0
  attr_accessor :value

  def initialize(value)

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# Caesar cipher module
#
# USAGE:
# =====
#   ```ruby
#   my_var = Plaintext.new 'TOO MANY SECRETS'
#   my_var.rotn # => "GBB ZNAL FRPERGF"
#   my_var # => "TOO MANY SECRETS"
#   ```
#   There is a bang method to make changes permanent:

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// Can be run online at https://p5js.org/ or alpha.editor.p5js.org/full/SykVmQWVG
const SCREEN = {
  width:  800,
  height: 600 }
const T12 = { 
  radii: [5.943, 7.290, 8.365, 11.315, 12.576, 14.497, 13.067, 12.151, 8.788, 7.941, 6.383, 5.495],
  cavity: 38.149 }
const FACTOR = 4

var myCircles

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/* 
USAGE EXAMPLES: 

Is the tenth row hidden?
> isRowHidden(sheet.getRange('B10')) 

Is column B hidden?
> isColumnHidden(sheet.getRange('B10'))

Is cell B10 visible? (not in a hidden row and/or column)

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#!/usr/bin/env bash

# C9.io Installation of the Red Language. +Info on "red-lang.org".

## USAGE: `chmod +x ./install-red.sh && sudo ./install-red.sh` 

REDLANG_PATH="/usr/local"
 
# For Linux 64-bit distros, you need to install 32-bit supporting libraries. 
# So, for Debian-based distros, install them using:

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Exercises

• What order (Invoice) was the most expensive?

    SELECT Invoice.InvoiceId, MAX(Invoice.Total)
    FROM Invoice;

  Total: 25.86,
  InvoiceId: 404,
  CustomerId: "6",