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comp.lang.ruby

Grouping values of a hash or array.

Adrian Fraiha

8/4/2006 6:03:00 PM

If I've got a hash
>h = { a => 1, b => 2, c => 1, d => 1 }
Is there an easy way to group the values to come out as 1,2?

Same for an away where [1,2,1,2,3] would come out as 1,2,3. I looked
through Ruby API and couldn't find anything. Anyone have any suggestions
as to how to go about this?

--
Posted via http://www.ruby-....
3 Answers

Berger, Daniel

8/4/2006 6:14:00 PM

0

Adrian Fraiha wrote:
> If I've got a hash
>> h = { a => 1, b => 2, c => 1, d => 1 }
> Is there an easy way to group the values to come out as 1,2?
>
> Same for an away where [1,2,1,2,3] would come out as 1,2,3
^^^^
You're from the Elmer Fudd school of Ruby programming apparently. :-P

> I looked
> through Ruby API and couldn't find anything. Anyone have any suggestions
> as to how to go about this?

See Array#uniq

Regards,

Dan


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Adrian Fraiha

8/4/2006 6:25:00 PM

0

:D Thanks for the help!

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Posted via http://www.ruby-....

Robert Klemme

8/4/2006 7:42:00 PM

0

Adrian Fraiha wrote:
> If I've got a hash
>> h = { a => 1, b => 2, c => 1, d => 1 }
> Is there an easy way to group the values to come out as 1,2?

irb(main):004:0> require 'set'
=> true
irb(main):006:0> { :a => 1, :b => 2, :c => 1, :d => 1 }.values.to_set
=> #<Set: {1, 2}>
irb(main):007:0> { :a => 1, :b => 2, :c => 1, :d => 1 }.values.to_set.to_a
=> [1, 2]

> Same for an away where [1,2,1,2,3] would come out as 1,2,3. I looked
> through Ruby API and couldn't find anything. Anyone have any suggestions
> as to how to go about this?

Same as above - or use uniq as has been mentioned already.

robert