From: anamma06@...
Date: 2018-09-19T22:11:31+00:00
Subject: [ruby-core:89085] [Ruby trunk Feature#14097] Add union and	difference to Array

Issue #14097 has been updated by ana06 (Ana Maria Martinez Gomez).


@matz

> The final proposal seems reasonable. Accepted.

Great to read that! ����

I have just rebased in [the PR](https://github.com/ruby/ruby/pull/1747), looking forward to see the `Array#union` method in Ruby!

----------------------------------------
Feature #14097: Add union and difference to Array
https://bugs.ruby-lang.org/issues/14097#change-74102

* Author: ana06 (Ana Maria Martinez Gomez)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 
----------------------------------------
Currently there is a concat method in ruby which does the same as +, but modifying the object. We could introduce a union and difference methods, which would be the equivalent for the `|` and `-` operators. This operators are normally less used due to lack of readability and expressivity. You end seeing thinks like:

```
array.concat(array2).uniq!
```

just because it is more readable. When it could be written like:

```
array |= array2
```

But, as this is not clear for some people, the new method will solve this problem:

```
array.union(array2)
```

And now this is clean and readable, as everybody expect from Ruby, the language focused on simplicity and productivity. ;)


Can I send a PR? :)





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