From: "عمر ملقب بالثانی" <bordelentoutgenre@...>
Date: 2008-07-12T03:49:06+09:00
Subject: inject idiom

Dear all,

I am new to Ruby (coming right away from Perl). I've been playing with
Hpricot for the sake of learning and wrote a simple script to hash link
entries with their tags from del.icio.us front page.

My first attempt is more or less Perl-inspired:

require 'hpricot'
require 'open-uri'

doc = Hpricot(open("http://del.icio.us/"))
tags = {}
doc.search("//div.hotlist/ol/li").each do |entry|
  link = entry.search("h4/a").first['href']
  taglist = []
  entry.search("div/ul/li/a").each do |tag|
    taglist <<  tag.inner_html
  end
  tags[link] = taglist
end

p tags

I then tried to use the inject method:

doc = Hpricot( open("http://del.icio.us/") )
tags = doc.search("//div.hotlist/ol/li").inject({}) do | hash, entry |
  link = entry.search("h4/a").first['href']
  hash[link] = entry.search("div/ul/li/a").inject([]) do | list, tag |
    list << tag.inner_html
  end
  hash
end

I wonder what the best practice is? The most readable and best suited to
Ruby-style of programming.  In Perl, although there is more than one way
to do every thing you want, there are definitely best practices. What
about Ruby? How do one use the inject idiom best?

Thanks in advance to all Rubyists for their help,

Ömer.
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