From: "Simon Kröger" <SimonKroeger@...>
Date: 2005-12-10T06:37:28+09:00
Subject: Re: new to Ruby - pls help in translating this

dblack@wobblini.net wrote:

>> quantities = Hash.new{|h, k| h[k]=0}
>> ARGF.each{|l| quantities[l.chomp.to_i] += 1}
> 
> 
> Since you're doing a h[x] += 1 thing, you don't need to do the
> auto-assignment in the block:
> 
>   quantities = Hash.new(0)
> 
> will work fine.

yes, saw that after pressing the submit button, but as said before
using this form of Hash.new is source of hard to track bugs.

> Also, String#to_i is smart enough not to need the chomp.
> 
> So, as so often happens, code evaporates from the screen as one works
> on a Ruby program :-)

you are so true:

require 'set'
seen = Set.new
puts ARGF.reject{|l| seen.add? l}


cheers

Simon