From: "Jan E." <lists@...>
Date: 2012-11-01T14:26:02+09:00
Subject: Re: need regex to check for consonants and put number after each consonant

I think you misunderstand how methods and blocks work. You continue to 
write a block after the method calls, but your method doesn't use blocks 
(there's no "yield"). So all the "print c" and "num_string += c" etc. is 
simply ignored. It has no effect at all.

What your method does is return the result of the conversion. So you can 
output the return value, store it in a variable etc.:


#----------------------------------
num = Num.new
# convert to num
num_converted = num.to_num("Wow! Look at this get converted to Num!")
puts num_converted
# convert back to English
puts num.to_english(num_converted)
#----------------------------------


Of course you *could* use blocks, but then you'd have to define your 
method accordingly. Judging from your examples, it seems you want to 
pass the conversion result to the block:


#----------------------------------
class Num
  def to_num( string )
    res = string.gsub( /(?<=[bcdfghj-np-tvwxz])/i, '0' )
    yield res if block_given?
    res
  end

  def to_english( num_string )
    res = num_string.gsub( /[0]/, '' )
    yield res if block_given?
    res
  end
end

num = Num.new
num.to_num( "Wow! Look at this get converted to Num!" ) do |result|
  puts result
end
#----------------------------------


However, I can't see any use for this block variant, because the method 
doesn't do anything useful with the block. So I'd simply return the 
value like above and not use blocks.

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