From: "Brian Schröder" <ruby.brian@...>
Date: 2005-08-08T21:43:32+09:00
Subject: Re: String#to_ary and Test::Unit

On 08/08/05, Trans <transfire@gmail.com> wrote:
> 
> David A. Black wrote:
> > This message is in MIME format.  The first part should be readable text,
> >   while the remaining parts are likely unreadable without MIME-aware tools.
> >
> > Hi --
> >
> > On Mon, 8 Aug 2005, [ISO-8859-1] Brian Schr�der wrote:
> >
> > > Another sidenote that removes the need for to_ary completely and is a
> > > lot faster:
> >
> > It's not needed if it's OK just to call #each, but I thought the
> > #to_ary call was part of Tom's original requirement.
> 
> Unfortunately David is correct. In looking more closely at your
> (Brian's) code offering, I see that it still uses #each. So in the
> context of String, the same problem arsies --I can't count on a string
> being iterated over by chars. I'll have to create an overriding #freq
> method specifically for string --and the other methods that work the
> same way.
> 
> T.
> 
>

Yes, but why not use:

probability_hash = "this is my string".split(//).freq

Each object that could support to_ary can also support each, while not
every object that has an each makes sense with to_ary. So it would
seem better to me to put this functionality into the enumerable and
supply an enumerable.

Then you can even do

module CharString
  def each(&block)
    self.split(//).each &block
  end
end

module WordString
  def each(&block)
    self.split(/\s+/).each &block
  end
end

charstring = "some chars"
class << charstring
  include CharString
end

charstring.freq_brian
 => {" "=>0.1, "a"=>0.1, "m"=>0.1, "c"=>0.1, "o"=>0.1, "e"=>0.1,
"r"=>0.1, "h"=>0.1, "s"=>0.2}

wordstring = "This is my word string"
class << wordstring
  include WordString
end

wordstring.freq_brian
 => {"my"=>0.2, "word"=>0.2, "This"=>0.2, "string"=>0.2, "is"=>0.2}

hth,

brian

-- 
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