From: Adam Shelly <adam.shelly@...>
Date: 2008-08-01T03:15:01+09:00
Subject: Re: Help me with this Numerology code please...

On 7/31/08, Dave Bass <davebass@musician.org> wrote:
> Karl-Heinz Wild wrote:
> > On 31.07.2008, at 12:23, Sebastian Hungerecker wrote:
> >
> >> 1}.to_s.split(//).inject(0) {|s,x| s + x.to_i}
> >> => 3
> >
> >
> > "RUBY".unpack("C*").inject(0) { |s,x| s + (x-64)%9 }%9
> > => 3
> >
> > whouldn't that be better?
>
> Obviously the harder to understand, the better.

There's also the small issue it gives inconsistent results.

irb(main):022:0> Name='I'
=> "I"
irb(main):023:0> Name.unpack("C*").inject(0) {|s,x| s + (x-65)%9 +
irb(main):024:1* 1}.to_s.split(//).inject(0) {|s,x| s + x.to_i}
=> 9
irb(main):025:0> Name.unpack("C*").inject(0) { |s,x| s + (x-64)%9 }%9
=> 0

And neither of these handle the case where you have to go through more
than two reductions.

The OP seems to be just learning ruby, so let's make this a learning exercise by
turning the manual process directly into code.
-Adam
---------------Numberology.rb------------------------------------
# first make a table to hold the number for every letter
number_of = {}
i =  1                       #starting with 1...
('A'..'Z').each {|letter|    #go through all the letters...
  number_of[letter] = i      #and assign a number
  i+=1                       #increase the number for the next letter
  i=1 if i>9                 #go back to 1 after 9
}
i=0                          #do the same thing for ....
('0'..'9').each{|digit|      #the text representation of each number
  number_of[digit] = i
  i+=1
}

namenumber=0                 #make a variable to store the namenumber
puts "enter a name"          #ask for...
name = gets().chomp          #and get a name (chomp off the newline char)
name.upcase!                 #convert it to uppercase to match the table
letters = name.split('')     #split it into an array of individual letters

#convert to numbers:
numbers = letters.map{ |letter| #'map' each letter to its number
  number_of[letter]             #using the table we made
}                                      #now we have an array of numbers

#we may have to do the next part more than once, so start a loop
loop do
  sum = 0                        #start with 0
  numbers.each{ |number|         #for each number in the array...
    sum+= number                 #add it to the sum
  }
  if sum <=9                     #if the sum is one digit...
      namenumber = sum           # it is our final number
      break                      # so break out of the loop
  else                           #otherwise
    digits = sum.to_s.split('')  # split the number into single digits
    numbers = digits.map{|digit| # map each text digit
      number_of[digit]           #to it's actual number,
    }                            #updating the array of numbers
  end
end                              #end of loop, go back to loop start

puts "The number of #{name} is #{namenumber}"   #show result