[ruby-core:83727] [Ruby trunk Bug#14097] Add union and difference to Array

Issue #14097 has been updated by mame (Yusuke Endoh).


I'm neutral to your proposal itself.  My two cents: `Array#union` should return a new array instead of modifying self, and `Array#union!` should be its modifying version.

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Bug #14097: Add union and difference to Array
https://bugs.ruby-lang.org/issues/14097#change-67764

* Author: ana06 (Ana Maria Martinez Gomez)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN
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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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