saas1hw1q6new_question

# -*- coding: utf-8 -*-
=begin
Karen West - April 7th, 2013 - homework#1 question#6
HW 1-6: Advanced OOP, Metaprogramming, Open Classes and Duck Typing

Part A — Currency conversion (ELLS 3.11): Extend the currency-conversion
example from lecture so that code such as the following will work:

    5.dollars.in(:euros)
    10.euros.in(:rupees)


You should support the currencies dollars, euros, rupees, yen where the
conversions are:

    rupees to dollars, multiply by 0.019,
    yen to dollars, multiply by 0.013,
    euro to dollars, multiply by 1.292.

Both the singular and plural forms of each currency should be acceptable, e.g.
1.dollar.in(:rupees) and 10.rupees.in(:euro) should work.

You can use the code shown in lecture as a starting point if you wish. It is
repeated below:

class Numeric
 @@currencies = {'yen' => 0.013, 'euro' => 1.292, 'rupee' => 0.019}
 def method_missing(method_id)
   singular_currency = method_id.to_s.gsub( /s$/, '')
   if @@currencies.has_key?(singular_currency)
     self * @@currencies[singular_currency]
   else
     super
   end
 end
end


Part B — Palindromes: Adapt your solution from the "palindromes" question
so that instead of writing palindrome?("foo") you can write "foo".palindrome?
(Hint: this should require fewer than 5 lines of code.)

Part C — Palindromes again: Adapt your palindrome solution so that it works on
Enumerables. That is:
[1,2,3,2,1].palindrome? # => true

It's not necessary for the collection's elements to be palindromes themselves--only that the top-level collection be a palindrome. (Hint: this should require fewer than 5 lines of code.) Although hashes are considered Enumerables, your solution does not need to work with hashes, though it should not error.


class Numeric
  @@currencies = {'yen' => 0.013, 'euro' => 1.292, 'rupee' => 0.019}
  def method_missing(method_id)
    singular_currency = method_id.to_s.gsub( /s$/, '')
    if @@currencies.has_key?(singular_currency)
      self * @@currencies[singular_currency]
    else
      super
    end
  end
end

class String
  # YOUR CODE HERE
end

module Enumerable
  # YOUR CODE HERE
end

#module Currency--found when searching for help--not my solution
require 'rubygems'

# This is allowing us to do the `pluralize` calls below
require 'active_support/inflector'
#Part A - Currency conversion
module Currency
  CONVERSION_TABLE = { dollars: { dollars: 1, euros: 0.75 }, euros: { dollars: 1.3333334, euros: 1 } }.freeze
  attr_accessor :currency

  def method_missing(method_name, *args, &block)
    # standardize on pluralized currency names internally so both singular
    # and plural methods are handled
    method_name = method_name.to_s.pluralize.to_sym

    # Use the "from" keys in the conversion table to verify this is a valid
    # source currency
    if CONVERSION_TABLE.key?(method_name)
      @currency = method_name
      self # return self so a call to `1.dollar` returns `1` and not `:dollars`
    else
      super
    end
  end

  # Convert `self` from type of `@currency` to type of `destination_currency`, mark the result with
  # the appropriate currency type, and return. Example:
  def to(destination_currency)
    # Again, standardize on plural currency names internally
    destination_currency = destination_currency.to_s.pluralize.to_sym

    # Do some sanity checking
    raise UnspecifiedSourceCurrency unless defined?(@currency)
    raise UnsupportedDestinationCurrency unless CONVERSION_TABLE.key?(destination_currency)

    # Do the actual conversion, and round for sanity, though a better
    # option would be to use BigDecimal which is more suited to handling money
    result = (self * CONVERSION_TABLE[@currency][destination_currency]).round(2)

    # note that this is setting @currency through the accessor that
    # was created by calling `attr_accessor :currency` above
    result.currency = destination_currency
    result
  end
end

class Numeric
  # Take all the functionality from Currency and mix it into Numeric
  #
  # Normally this would help us encapsulate, but right now it's just making
  # for cleaner reading. My original example contained more encapsulation
  # that avoided littering the Numeric clas, but it's harder for a beginner
  # to understand. For now, just start here and you will learn more later.
  include Currency
end

p 5.euros.to(:dollars)                #=> 6.67
p 0.25.dollars.to(:euro)              #=> 0.19
p 1.dollar.to(:euros).to(:dollar)     #=> 1.0
=end


=begin
Part A — Currency conversion (ELLS 3.11): Extend the currency-conversion
example from lecture so that code such as the following will work:

    5.dollars.in(:euros)
    10.euros.in(:rupees)

You should support the currencies dollars, euros, rupees, yen where the
conversions are:

    rupees to dollars, multiply by 0.019,
    yen to dollars, multiply by 0.013,
    euro to dollars, multiply by 1.292.

Part B — Palindromes: Adapt your solution from the "palindromes" question
so that instead of writing palindrome?("foo") you can write "foo".palindrome?
(Hint: this should require fewer than 5 lines of code.)

Part C — Palindromes again: Adapt your palindrome solution so that it works on
Enumerables. That is:
[1,2,3,2,1].palindrome? # => true

=end
class Numeric
 @@currencies = {'yen' => 0.013, 'euro' => 1.292, 'rupee' => 0.019, 'dollar' => 1.0}
 def method_missing(method_id)
   singular_currency = method_id.to_s.gsub( /s$/, '') #remove plural
   if @@currencies.has_key?(singular_currency) #have currency?
     if (method_id == 'dollar') #self = numeric number, method_id = currency
       value = self * @@currencies[singular_currency] #currency value in dollars
     else #if currency is not dollar first time through
       value = self / @@currencies[singular_currency] #numeric/currency conv.
     end
     #puts "currency"
     #puts singular_currency
     #puts "times"
     #puts self
     #puts "equals"
     #puts value
     return value
   else
     #puts "calling super class"
     super
   end
 end
 def in(currency)
   #puts "in calling method_missing with currency"
   #puts currency
   singular_currency = currency.to_s.gsub( /s$/, "") #remove plural
   if @@currencies.has_key?(singular_currency) #have currency?
     value = self * @@currencies[singular_currency]
     #puts value
     return value
   else
     super
   end
 end
end
#puts "5 dollars in euros is "
#5.dollars.in(:euros)
#puts "10 euros in rupees is "
#10.euros.in(:rupees)

# convert list to string -- do not need to use yield here
module Enumerable
  def palindrome?()
    strOrArray = ""
    if self.is_a? Array
      #puts "Array type"
      #puts self
      strOrArray = self.join
    end
    strOrArray = strOrArray.downcase
    #puts "after converting list(array)->string"
    #puts strOrArray
    #remove all punctuation from string
    #newstr = strOrArray.gsub(/[ !:;'?,. -- _0123456789]/,'')
    newstr = strOrArray
    revStr = ""
    revStr = strOrArray.reverse
    #puts "newstr"
    #puts newstr
    #puts "revStr"
    #puts revStr
    if (newstr == newstr)
      return true
    else
      return false
    end
  end
end


class String
  def palindrome?()
    # YOUR CODE HERE
    #if (self.is_a? String)
      #strOrArray = ""
      #strOrArray = self
    #elsif (self.is_a? Array)
      #strOrArray = ""
      #strOrArray << self.returnStr
      #inputArray = []
      #inputArray = self
      #strOrArray = inputArray.join
    #end
    strOrArray = ""
    strOrArray = self
    strOrArray = strOrArray.downcase #for regexp - use /W (anything NOT [a-z][A-Z][0-9])
    puts strOrArray
    #remove all punctuation from string
    newstr = strOrArray.gsub(/[ !:;'?,. -- _0123456789]/,'')
    #newstr= strOrArray
    revStr = ""
    revStr = newstr.reverse
    if (newstr == revStr)
      return true
    else
      return false
    end
  end
end

#the code below this line will test your functions.  You should remove everything below this line prior to submitting your file

=begin
test_str = "there goes the neighborhood"

if test_str.palindrome?
  puts test_str + " is a palindrome!"
else
  puts test_str + " is NOT a palindrome!"
end


test_str = "Madam, I'm Adam"

if test_str.palindrome?
  puts test_str + " is a palindrome!"
else
  puts test_str + " is NOT a palindrome!"
end

test_str = "A man, a plan, a canal -- Panama"
if test_str.palindrome?
  puts test_str + " is a palindrome!"
else
  puts test_str + " is NOT a palindrome!"
end

test_str =  "Abracadabra"
if test_str.palindrome?
  puts test_str + " is a palindrome!"
else
  puts test_str + " is NOT a palindrome!"
end

test_list = [1,2,3,2,1]
if test_list.palindrome?
  puts test_list
  puts "is a palindrome!"
else
  puts test_list
  puts "is NOT a palindrome!"
end
=end

=begin
On Time
Currency conversion
  correctly converts currency from rupees to dollars (singular) [2 points] (FAILED)
  correctly converts currency from yen to dollars (singular) [2 points] (FAILED)
  correctly converts currency from euro to dollars (singular) [2 points] (FAILED)
  correctly converts currency from rupees to dollars (plural) [3 points] (FAILED)
  correctly converts currency from yen to dollars (plural) [3 points] (FAILED)
  correctly converts currency from euro to dollars (plural) [3 points] (FAILED)
  correctly converts currency from rupees to yen, euros to rupees, yen to euros [15 points] (FAILED)

adapted palindrome?
  correctly identifies positive and negative palindromes [30 points] (FAILED)

enumerable palindrome?
  correctly identifies simple array positive palindromes [6 points]
  correctly identifies simple array non-palindromes [6 points] (FAILED)
  should not error on non-sensical cases of enumerables, like hashes [5 points]
  should still work for the case of non-array enumerables that do make sense, like iterators (valid palindrome) [15 points]
  should still work for non-array enumerables that do make sense (invalid palindromes) [8 points] (FAILED)

Failures:

  1) Currency conversion correctly converts currency from rupees to dollars (singular) [2 points]
     Failure/Error: 2.rupee.in(:dollar).should be_within(0.001).of(0.038)
       expected 105.26315789473685 to be within 0.001 of 0.038
     # /tmp/rspec20130419-23070-b6qqge.rb:321:in `block (2 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:306:in `block (3 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:305:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:9:in `block (3 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:8:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_runner.rb:42:in `block in run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:33:in `run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:24:in `run'
     # lib/graders/rspec_grader/weighted_rspec_grader.rb:6:in `grade!'
     # ./grade:31:in `<main>'

  2) Currency conversion correctly converts currency from yen to dollars (singular) [2 points]
     Failure/Error: 3.yen.in(:dollar).should be_within(0.001).of(0.039)
       expected 230.76923076923077 to be within 0.001 of 0.039
     # /tmp/rspec20130419-23070-b6qqge.rb:324:in `block (2 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:306:in `block (3 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:305:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:9:in `block (3 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:8:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_runner.rb:42:in `block in run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:33:in `run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:24:in `run'
     # lib/graders/rspec_grader/weighted_rspec_grader.rb:6:in `grade!'
     # ./grade:31:in `<main>'

  3) Currency conversion correctly converts currency from euro to dollars (singular) [2 points]
     Failure/Error: 6.euro.in(:dollar).should be_within(0.005).of(7.755)
       expected 4.643962848297213 to be within 0.005 of 7.755
     # /tmp/rspec20130419-23070-b6qqge.rb:327:in `block (2 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:306:in `block (3 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:305:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:9:in `block (3 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:8:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_runner.rb:42:in `block in run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:33:in `run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:24:in `run'
     # lib/graders/rspec_grader/weighted_rspec_grader.rb:6:in `grade!'
     # ./grade:31:in `<main>'

  4) Currency conversion correctly converts currency from rupees to dollars (plural) [3 points]
     Failure/Error: 2.rupees.in(:dollars).should be_within(0.001).of(0.038)
       expected 105.26315789473685 to be within 0.001 of 0.038
     # /tmp/rspec20130419-23070-b6qqge.rb:332:in `block (2 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:306:in `block (3 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:305:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:9:in `block (3 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:8:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_runner.rb:42:in `block in run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:33:in `run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:24:in `run'
     # lib/graders/rspec_grader/weighted_rspec_grader.rb:6:in `grade!'
     # ./grade:31:in `<main>'

  5) Currency conversion correctly converts currency from yen to dollars (plural) [3 points]
     Failure/Error: 3.yen.in(:dollars).should be_within(0.001).of(0.039)
       expected 230.76923076923077 to be within 0.001 of 0.039
     # /tmp/rspec20130419-23070-b6qqge.rb:335:in `block (2 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:306:in `block (3 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:305:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:9:in `block (3 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:8:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_runner.rb:42:in `block in run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:33:in `run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:24:in `run'
     # lib/graders/rspec_grader/weighted_rspec_grader.rb:6:in `grade!'
     # ./grade:31:in `<main>'

  6) Currency conversion correctly converts currency from euro to dollars (plural) [3 points]
     Failure/Error: 6.euros.in(:dollars).should be_within(0.005).of(7.755)
       expected 4.643962848297213 to be within 0.005 of 7.755
     # /tmp/rspec20130419-23070-b6qqge.rb:338:in `block (2 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:306:in `block (3 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:305:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:9:in `block (3 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:8:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_runner.rb:42:in `block in run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:33:in `run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:24:in `run'
     # lib/graders/rspec_grader/weighted_rspec_grader.rb:6:in `grade!'
     # ./grade:31:in `<main>'

  7) Currency conversion correctly converts currency from rupees to yen, euros to rupees, yen to euros [15 points]
     Failure/Error: 5.rupees.in(:yen).should be_within(0.1).of(7.3)
       expected 3.421052631578948 to be within 0.1 of 7.3
     # /tmp/rspec20130419-23070-b6qqge.rb:343:in `block (2 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:306:in `block (3 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:305:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:9:in `block (3 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:8:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_runner.rb:42:in `block in run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:33:in `run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:24:in `run'
     # lib/graders/rspec_grader/weighted_rspec_grader.rb:6:in `grade!'
     # ./grade:31:in `<main>'

  8) adapted palindrome? correctly identifies positive and negative palindromes [30 points]
     Failure/Error: "Rac~~~Ec:A!r".should be_a_palindrome
       expected palindrome? to return true, got false
     # /tmp/rspec20130419-23070-b6qqge.rb:354:in `block (2 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:306:in `block (3 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:305:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:9:in `block (3 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:8:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_runner.rb:42:in `block in run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:33:in `run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:24:in `run'
     # lib/graders/rspec_grader/weighted_rspec_grader.rb:6:in `grade!'
     # ./grade:31:in `<main>'

  9) enumerable palindrome? correctly identifies simple array non-palindromes [6 points]
     Failure/Error: [1,2,3,4,3,2].should_not be_a_palindrome
       expected palindrome? to return false, got true
     # /tmp/rspec20130419-23070-b6qqge.rb:386:in `block (2 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:306:in `block (3 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:305:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:9:in `block (3 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:8:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_runner.rb:42:in `block in run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:33:in `run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:24:in `run'
     # lib/graders/rspec_grader/weighted_rspec_grader.rb:6:in `grade!'
     # ./grade:31:in `<main>'

  10) enumerable palindrome? should still work for non-array enumerables that do make sense (invalid palindromes) [8 points]
     Failure/Error: (1..2).should_not be_a_palindrome
       expected palindrome? to return false, got true
     # /tmp/rspec20130419-23070-b6qqge.rb:402:in `block (2 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:306:in `block (3 levels) in <top (required)>'
     # /tmp/rspec20130419-23070-b6qqge.rb:305:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:9:in `block (3 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_sandbox.rb:8:in `block (2 levels) in <top (required)>'
     # lib/graders/rspec_grader/rspec_runner.rb:42:in `block in run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:33:in `run_rspec'
     # lib/graders/rspec_grader/rspec_runner.rb:24:in `run'
     # lib/graders/rspec_grader/weighted_rspec_grader.rb:6:in `grade!'
     # ./grade:31:in `<main>'

Finished in 0.04917 seconds
13 examples, 10 failures

Failed examples:

rspec /tmp/rspec20130419-23070-b6qqge.rb:320 # Currency conversion correctly converts currency from rupees to dollars (singular) [2 points]
rspec /tmp/rspec20130419-23070-b6qqge.rb:323 # Currency conversion correctly converts currency from yen to dollars (singular) [2 points]
rspec /tmp/rspec20130419-23070-b6qqge.rb:326 # Currency conversion correctly converts currency from euro to dollars (singular) [2 points]
rspec /tmp/rspec20130419-23070-b6qqge.rb:331 # Currency conversion correctly converts currency from rupees to dollars (plural) [3 points]
rspec /tmp/rspec20130419-23070-b6qqge.rb:334 # Currency conversion correctly converts currency from yen to dollars (plural) [3 points]
rspec /tmp/rspec20130419-23070-b6qqge.rb:337 # Currency conversion correctly converts currency from euro to dollars (plural) [3 points]
rspec /tmp/rspec20130419-23070-b6qqge.rb:342 # Currency conversion correctly converts currency from rupees to yen, euros to rupees, yen to euros [15 points]
rspec /tmp/rspec20130419-23070-b6qqge.rb:351 # adapted palindrome? correctly identifies positive and negative palindromes [30 points]
rspec /tmp/rspec20130419-23070-b6qqge.rb:385 # enumerable palindrome? correctly identifies simple array non-palindromes [6 points]
rspec /tmp/rspec20130419-23070-b6qqge.rb:401 # enumerable palindrome? should still work for non-array enumerables that do make sense (invalid palindromes) [8 points]
=end