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


I'm now for the addition.  By the way, don't you need `Array#intersection`?

----------------------------------------
Feature #14097: Add union and difference to Array
https://bugs.ruby-lang.org/issues/14097#change-73804

* Author: ana06 (Ana Maria Martinez Gomez)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 
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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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