From: anamma06@...
Date: 2018-08-26T08:52:50+00:00
Subject: [ruby-core:88652] [Ruby trunk Feature#14097] Add union and	difference to Array

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


@mame

> However, I'm now getting confused. I thought you agreed that Array#union should be non-destructive, but in your talk you explained it was a destructive union operator. What are you driving at?

In the talk I wanted to focus on the necessity of having an `union` method without entering in the discussion of if it should be non-destructive or not. It didn't seem that important to me if it is needed to add a `!` or not. But you are right, having `union!` in the voting would have been better. @matz gave me the same feedback after the talk. ;)



----------------------------------------
Feature #14097: Add union and difference to Array
https://bugs.ruby-lang.org/issues/14097#change-73708

* 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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