Forum: Ruby how to join the return of array

I know joining arrays and strings but this issue is very specific to an
api I am working on :

 All I want is all hq.close value in an array. EG:
[
   {'GOOG' => [744.75,751.48,744.56,744.09,757.84]},
   {'MSFT' => {value1,value2, .....}}
]


Reason I am not able to get the above array of hash is because when I do
puts hq.close its printing individual value and I am not sure how to get
all hq.close into one array

Based on code below my output is : (but i want it in above format)

GOOG -> 744.75
GOOG -> 751.48
GOOG -> 744.56
GOOG -> 744.09
GOOG -> 757.84
MSFT -> 29.2
MSFT -> 28.95
MSFT -> 28.98
MSFT -> 29.28
MSFT -> 29.78

    require 'yahoofinance'

    #Stock symbols
    user_input = ['GOOG','MSFT']

    user_input.each do|symb|

             YahooFinance::get_HistoricalQuotes( symb,
                                                          Date.parse('2012-10-06'),
                                                          Date.today() )
do   |hq|

                puts "#{symb} -> #{hq.close}"
              end
   end

out = Hash.new do {|h,v| h[v] = []}

YahooFinance::get_HistoricalQuotes( symb, Date.parse('2012-10-06'), 
Date.today() ) do |hq|
  puts "#{symb} -> #{hq.close}"
  out[symb] << hq.close
end

Henry

Thanks a bunch !
  This works like a charm but just curious why I have to initialize and 
I could not just do

  out[symb] << hq.close

  without initialize


Henry Maddocks wrote in post #1079818:
> out = Hash.new do {|h,v| h[v] = []}
>
> YahooFinance::get_HistoricalQuotes( symb, Date.parse('2012-10-06'),
> Date.today() ) do |hq|
>   puts "#{symb} -> #{hq.close}"
>   out[symb] << hq.close
> end
>
> Henry

On 15/10/2012, at 10:04 AM, Ruby Mania <lists@ruby-forum.com> wrote:

> Thanks a bunch !
>  This works like a charm but just curious why I have to initialize and
> I could not just do
>
>  out[symb] << hq.close
>
>  without initialise

Because the default value of an uninitialised hash key is nil and nil 
doesn't respond to <<


>> out = {}
=> {}
>> out['foo']
=> nil
>> out['foo'] << 'bar'
NoMethodError: undefined method `<<' for nil:NilClass
  from (irb):3
  from /Users/henry/.rbenv/versions/1.9.3-p125/bin/irb:12:in `<main>'
>>


Henry

Superb ! thnx ! I was mising on such a small concept :(

Henry Maddocks wrote in post #1079820:

> Because the default value of an uninitialised hash key is nil and nil
> doesn't respond to <<
>
>
>>> out = {}
> => {}
>>> out['foo']
> => nil
>>> out['foo'] << 'bar'
> NoMethodError: undefined method `<<' for nil:NilClass
>   from (irb):3
>   from /Users/henry/.rbenv/versions/1.9.3-p125/bin/irb:12:in `<main>'
>>>
>
>
> Henry