Rails - Jul 2008 - create an array from a hash that includes key and value

Hello there, I have the hash:

@hash = {"a"=>"1", "b"=>"2",
"c"=>"3"}

And I need to create an array:

@array = [
[''a'',''1''],[''b'',''2''],[''c'',''3'']
]

How do I do that?

Paco Reyes


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@hash.to_a
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Hi --

On Fri, 18 Jul 2008, paco.onrails wrote:
>
> Hello there, I have the hash:
>
> @hash = {"a"=>"1", "b"=>"2",
"c"=>"3"}
>
> And I need to create an array:
>
> @array = [
[''a'',''1''],[''b'',''2''],[''c'',''3'']
]
>
> How do I do that?
@hash.to_a


David

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On Jul 18, 2008, at 11:19 AM, paco.onrails wrote:
> Hello there, I have the hash:
>
> @hash = {"a"=>"1", "b"=>"2",
"c"=>"3"}
>
> And I need to create an array:
>
> @array = [
[''a'',''1''],[''b'',''2''],[''c'',''3'']
]
>
> How do I do that?
>
> Paco Reyes

Either:
   @array = @hash.to_a

or:
   @array = @hash.to_a.sort

depending on whether the order matters.  A Hash (in Ruby 1.8.6 and  
earlier) is inherently unordered and the conversion to an array gives  
elements in the same order that @hash.each would yield them.

-Rob


Rob Biedenharn		http://agileconsultingllc.com
Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org


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Rob,
Could I ride this thread with a short variation? I have a zillion
dropdowns in my project that ask users what code they should choose.
As a ficticious example they''d be asked what day of the week ( 1 -
Sunday, 2 - Monday, 3 - Tuesday, etc. )
I''d like to simply create this as an array and pass it to my
collection_select helper. This would save me having to create another
model and migration.
What throws me is that the first member of an array has a zero 0 key
and I want it to be one 1.
Could someone show me the simple way to load an array with key - value
combinations that starts with one 1.
Thank you,
Kathleen


On Jul 18, 11:55 am, Rob Biedenharn
<R...-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org>
wrote:
> On Jul 18, 2008, at 11:19 AM, paco.onrails wrote:
>
> > Hello there, I have the hash:
>
> > @hash = {"a"=>"1",
"b"=>"2", "c"=>"3"}
>
> > And I need to create an array:
>
> > @array = [
[''a'',''1''],[''b'',''2''],[''c'',''3'']
]
>
> > How do I do that?
>
> > Paco Reyes
>
> Either:
>    @array = @hash.to_a
>
> or:
>    @array = @hash.to_a.sort
>
> depending on whether the order matters.  A Hash (in Ruby 1.8.6 and  
> earlier) is inherently unordered and the conversion to an array gives  
> elements in the same order that @hash.each would yield them.
>
> -Rob
>
> Rob Biedenharn          http://agileconsultingllc.com
> R...-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org
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