From: Drew Olson <olsonas@...>
Date: 2007-05-10T04:02:08+09:00
Subject: What's the most ruby-ish way to write this python code?

All -

I've been using ruby for quite some time and I'm only beginning to look
at python. I really like the way ruby flows as compared to python and I
can't see myself getting pulled away from ruby. However, there is one
thing I like about python, and that is the generators. What is the best
way to translate the following code into ruby? Assume word is some
string and letters is a string of all the characters a..z:

[word[0:i]+c+word[i+1:] for i in range(len(word)) for c in letters]

This is all based on trying to efficiently rewrite
http://norvig.com/spell-correct.html in ruby. Essentially what this code
does is get the array of words resulting from inserting every character
at every possible position in the given word. I find it pretty succinct,
but I know ruby can do better! I've come up with two ways to do this in
ruby, but neither seems to "click" with me:

(0...word.size).inject([]) do |words,i|
  letters.split('').each do |c|
    words << word[0...i]+c+word[i..-1]
  end
  words
end

OR

(0...words.size).map do |i|
  letters.split('').map do |c|
    word[0...i]+c+word[i..-1]
  end
end.flatten

Any advice? Currenty, I'm using the first approach and it's sloooooow
(I'm assuming inject has high overhead).

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