# Grouping values of a hash or array

**URL:** <https://www.ruby-forum.com/t/grouping-values-of-a-hash-or-array/101421>\
**Category:** Ruby\
**Created:** [August 4, 2006, 8:02pm UTC](https://www.ruby-forum.com/t/grouping-values-of-a-hash-or-array/101421 "2006-08-04T20:02:52Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![adrian](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/82dd89/32.png) [@adrian](https://www.ruby-forum.com/u/adrian)\
**Post date:** [August 4, 2006, 8:02pm UTC](https://www.ruby-forum.com/t/grouping-values-of-a-hash-or-array/101421/1 "2006-08-04T20:02:52Z")

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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?

---

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**Author:** ![adrian](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/82dd89/32.png) [@adrian](https://www.ruby-forum.com/u/adrian)\
**Post date:** [August 4, 2006, 8:15pm UTC](https://www.ruby-forum.com/t/grouping-values-of-a-hash-or-array/101421/2 "2006-08-04T20:15:54Z")

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Adrian F. 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. 😛

> 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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<div class="post-metadata">

**Author:** ![adrian](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/82dd89/32.png) [@adrian](https://www.ruby-forum.com/u/adrian)\
**Post date:** [August 4, 2006, 8:24pm UTC](https://www.ruby-forum.com/t/grouping-values-of-a-hash-or-array/101421/3 "2006-08-04T20:24:53Z")

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😃 Thanks for the help!

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<div class="post-metadata">

**Author:** ![adrian](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/82dd89/32.png) [@adrian](https://www.ruby-forum.com/u/adrian)\
**Post date:** [August 4, 2006, 9:46pm UTC](https://www.ruby-forum.com/t/grouping-values-of-a-hash-or-array/101421/4 "2006-08-04T21:46:07Z")

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Adrian F. 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
```