From: Sam Duncan <sduncan@...>
Date: 2011-10-20T13:29:59+09:00
Subject: Re: why doesn't this work?

On 20/10/11 16:48, botp wrote:
> On Thu, Oct 20, 2011 at 6:23 AM, Gunther Diemant<g.diemant@gmx.net>  wrote:
>> def find_frequency(sentence, word)
>>   sentence.split(/ /).select { |w| w.downcase == word.downcase }.length
>> end
>> or maybe even better:
>> def find_frequency(sentence, word)
>>   sentence.split(/ /).map { |w| w.downcase }.count(word.downcase)
>> end
> count does accept a block, so
>
> def find_frequency(sentence, word)
>    word=word.downcase
>    sentence.split.count{ |w| w.downcase == word}
> end
Just for fun

ruby-1.9.2-p290 :001 > lorem = "On the other hand, we denounce with 
righteous indignation and dislike men who are so beguiled and 
demoralized by the charms of pleasure of the moment, so blinded by 
desire, that they cannot foresee the pain and trouble that are bound to 
ensue; and equal blame belongs to those who fail in their duty through 
weakness of will, which is the same as saying through shrinking from 
toil and pain. These cases are perfectly simple and easy to distinguish. 
In a free hour, when our power of choice is untrammelled and when 
nothing prevents our being able to do what we like best, every pleasure 
is to be welcomed and every pain avoided. But in certain circumstances 
and owing to the claims of duty or the obligations of business it will 
frequently occur that pleasures have to be repudiated and annoyances 
accepted. The wise man therefore always holds in these matters to this 
principle of selection: he rejects pleasures to secure other greater 
pleasures, or else he endures pains to avoid worse pains."
  => "On the other hand, we denounce with righteous indignation and 
dislike men who are so beguiled and demoralized by the charms of 
pleasure of the moment, so blinded by desire, that they cannot foresee 
the pain and trouble that are bound to ensue; and equal blame belongs to 
those who fail in their duty through weakness of will, which is the same 
as saying through shrinking from toil and pain. These cases are 
perfectly simple and easy to distinguish. In a free hour, when our power 
of choice is untrammelled and when nothing prevents our being able to do 
what we like best, every pleasure is to be welcomed and every pain 
avoided. But in certain circumstances and owing to the claims of duty or 
the obligations of business it will frequently occur that pleasures have 
to be repudiated and annoyances accepted. The wise man therefore always 
holds in these matters to this principle of selection: he rejects 
pleasures to secure other greater pleasures, or else he endures pains to 
avoid worse pains."
ruby-1.9.2-p290 :002 > def find_frequency(prose, word)
ruby-1.9.2-p290 :003?>   prose.scan(/\b(#{word})\b/im).length
ruby-1.9.2-p290 :004?>   end
  => nil
ruby-1.9.2-p290 :005 > find_frequency(lorem, "selection")
  => 1
ruby-1.9.2-p290 :006 > find_frequency(lorem, "and")
  => 10
ruby-1.9.2-p290 :007 > find_frequency(lorem, "frequently")
  => 1
ruby-1.9.2-p290 :008 > find_frequency(lorem, "that")
  => 3

Sam