From: Brian Candler <b.candler@...>
Date: 2009-04-29T22:08:27+09:00
Subject: Re: Random Access using IO#pos in code blocks

Arun Kumar wrote:
>>    freq[word] ||= [0]
>>    freq[word][0] += 1
>>    freq[word] << f.pos << file_name
>>
>>
> I've tried doing it but since 'freq' is a hash it gives the following 
> error:

Show your actual code. The following code works just fine:

freq = {}
%w{foo bar baz bar}.each do |word|
  freq[word] ||= [0]
  freq[word][0] += 1
  freq[word] << "pos" << "name"
end
puts freq.inspect

The error suggests that you have initialized freq[word] to 0, not to 
[0].

Or perhaps you set freq = Hash.new(0), which is wrong in this case, 
because the default element needs to be [0] not 0.

An alternative is to auto-initialize each hash element like this:

freq = Hash.new { |h,k| h[k] = [0] }
%w{foo bar baz bar}.each do |word|
  freq[word][0] += 1
  freq[word] << "pos" << "name"
end
puts freq.inspect
-- 
Posted via http://www.ruby-forum.com/.