From: wilburlo@...
Date: 2015-07-02T01:39:21+00:00
Subject: [ruby-core:69836] [Ruby trunk - Feature #11323] [Open] Documentation update on how uniq works / guarantee of order

Issue #11323 has been reported by Daniel Lo.

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Feature #11323: Documentation update on how uniq works / guarantee of order
https://bugs.ruby-lang.org/issues/11323

* Author: Daniel Lo
* Status: Open
* Priority: Normal
* Assignee: 
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Greetings,

I was looking at Array.uniq and I was wondering how the code made the array unique.

There are 2 different possible outcomes for making an array unique.

For example:
[1,2,1]

The first value is kept and all subsequent duplicate values are removed: [1,2]
or
The array is made unique, order is not retained: [2,1]

Would the ruby team consider adding a guarantee of order (first seen/first kept) is adding this to the Array.uniq specification?  This is what happens in practice (irb), having this as part of the specification would be nice.

I looked at the code http://ruby-doc.org/core-2.2.1/Array.html#method-i-uniq however, I wasn't able to determine exactly how it worked. :(

Thank you!

Regards,

Daniel Lo




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