Tom Harris tomharris

Keybase proof

I hereby claim:

I am tomharris on github.
I am tomharris (https://keybase.io/tomharris) on keybase.
I have a public key whose fingerprint is 4EE9 2C56 96E3 3A36 82F0 F7C4 3DE7 4993 F0A5 47A9

To claim this, I am signing this object:

Luhn Checksum

Implement a Ruby program that outputs the validity of a number by applying the Luhn Checksum.

http://en.wikipedia.org/wiki/Luhn_algorithm

Please treat this as you would any other task you'd encounter during your daily work. This will show us how currently code, and not how you coded 6, 12 or 18 months ago. Your code should also be suitably tested. Also, please do not feel that you need to spend a great deal of time working on a solution.

There are many solutions and code snippets online to do a Luhn Checksum. Please resist using those.

	require "net/http"
	require "uri"

	module Google
	class Geocode
	attr_accessor :address
	attr_reader :key, :latutude, :longitude

	def initialize( key, address )
	@key = key

	class WordDictionary

	def initialize(dictionary_filename = '/usr/share/dict/words')
	@words = File.readlines(dictionary_filename)
	@words = @words.collect { \|word\| word.strip } # File.readlines preserves the newlines at the end of the line
	end

	def words_with_five_vowels_in_ascending_order
	@words.select { \|word\| word.count('aeiou') == 5 && word =~ /.?[aA].?[eE].?[iI].?[oO].?[uU].?/ }
	end

	class SomeModel
	after_save :queue_a_task, unless: lambda { !!@callbacks_disabled }

	def do_something_without_queuing_a_task
	disable_callbacks!
	do_something_that_triggers_callbacks
	enable_callbacks!
	end

	private

	def upload

	# ...

	AWS::S3::Base.establish_connection!(
	:access_key_id => aws_access_key_id,
	:secret_access_key => aws_secret_access_key
	)

	File.open(file_path) do \|file\|

	module DataLoad
	class Thing1

	def reload_all
	connection = ActiveRecord::Base.connection

	sql = <<-SQL
	create temporary table tmp_thing1 (
	-- ...
	)

	Date::DATE_FORMATS[:custom_format] = '%m/%d/%Y'

	# ...

	user.created_at.to_s(:custom_format)

	module DataLoad
	class Thing1
	include DatabaseConnectionHelper

	def reload_all
	with_master_connection do \|connection\|
	sql = <<-SQL
	create temporary table tmp_thing1 (
	-- ...
	)

	class Thing < ActiveRecord::Base
	def self.sort_by_column(column, direction)
	if column_names.include?(column) and %w(asc desc).include?(direction)
	order("#{column} #{direction}")
	else
	self
	end
	end
	end