From: chen li <chen_li3@...>
Date: 2006-12-15T04:08:05+09:00
Subject: Re: Hash/2-d array help!


> Ah....now that's a lot simpler then I thought.
> How would I then retrieve these values?
> 
> puts hash gives error as does puts hash[England] or
> puts 
> hash{England}...Are they counted in anyway like
> hash{england[1]}?

Hi,

This is right syntax to create a hash(with single or
double quotes), actually you declare a hash of
arrays(HOA):


hash = {
      'England' => ['Liverpool', 'London',
'Plymouth'],
      'France' => ['Rennes', 'Paris']
}

If you just write 
England=>[Liverpool, London, Plymouth]

Ruby thinks every of them is a constant due to
capitalization.


hash.fetch('England') will return an array then you
index the array to get the element you want.

Li

C:\>irb
irb(main):001:0> hash = {
irb(main):002:1*       'England' => ['Liverpool',
'London', 'Plymouth'],
irb(main):003:1*       'France' => ['Rennes', 'Paris']
irb(main):004:1> }
=> {"France"=>["Rennes", "Paris"],
"England"=>["Liverpool", "London", "Plymouth"]}
irb(main):005:0> hash.fetch('England')[0]
=> "Liverpool"
irb(main):006:0> hash.fetch('England')[2]
=> "Plymouth"
irb(main):007:0>



 
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