[ruby-core:111563] [Ruby master Feature#16991] Sets: add Set#join

Issue #16991 has been updated by zverok (Victor Shepelev).

Status changed from Open to Closed

Implemented in Ruby 3.0

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Feature #16991: Sets: add Set#join
https://bugs.ruby-lang.org/issues/16991#change-100928

* Author: marcandre (Marc-Andre Lafortune)
* Status: Closed
* Priority: Normal
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I'd like to add `#join` to `Set`:

```ruby
# Now:
Set[1, 2, 3].join('x') # => NoMethodError
# After
Set[1, 2, 3].join('x') # => "1x2x3"
```

I'd make this join never recursive. (I've never wanted to use the recursivity of `Array#join`, but it may very well just be my particular experience)

Reminder: Why there is no `Enumerable#join`: https://bugs.ruby-lang.org/issues/1893



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