[ruby-core:122612] [Ruby Feature#21455] Add a block argument to Array#join

28 Jun 2025

      Issue #21455 has been reported by leoarnold (Leo Arnold).

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Feature #21455: Add a block argument to Array#join
https://bugs.ruby-lang.org/issues/21455

* Author: leoarnold (Leo Arnold)
* Status: Open
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I sometimes come across code like this where
the `Array#join` at the end can easily
be overlooked or stands out like a sore thumb:

```ruby
hex_string = string.bytes.map do |byte|
  format('%02X', byte)
end.join(' ')
```

It seems idiomatic and more succinct
to pass the block to `Array#join` directly:

```ruby
hex_string = string.bytes.join(' ') do |byte|
  format('%02X', byte)
end
```

-- 
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