[ruby-core:87246] [Ruby trunk Feature#14097] Add union and difference to Array

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


@matz

> I am not sure your real intention. Do you want mutating variation of or-operator?
> Or just more readable alias of or-operator?

Thanks for taking a look at the issue. What I am proposing is a new union method that it is an alias for `|` in the case of two arrays but that it is also more efficient in the case of more than two arrays. Exactly as it happens with `+` and `concat`. `concat`, apart from modifying the first array (which maybe shouldn't be the case) is more readable, but in the case on more than two arrays is more efficient as well.

I also send a PR with a possible implementation: https://github.com/ruby/ruby/pull/1747

----------------------------------------
Feature #14097: Add union and difference to Array
https://bugs.ruby-lang.org/issues/14097#change-72235

* Author: ana06 (Ana Maria Martinez Gomez)
* Status: Open
* Priority: Normal
* Assignee: 
* 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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