From: "andrykonchin (Andrew Konchin)" <noreply@...>
Date: 2022-05-10T13:29:08+00:00
Subject: [ruby-core:108502] [Ruby master Bug#18770] Inconsistent behavior of IO/StringIO's each methods when called with nil as a separator, limit and chomp: true

Issue #18770 has been reported by andrykonchin (Andrew Konchin).

----------------------------------------
Bug #18770: Inconsistent behavior of IO/StringIO's each methods when called with nil as a separator, limit and chomp: true
https://bugs.ruby-lang.org/issues/18770

* Author: andrykonchin (Andrew Konchin)
* Status: Open
* Priority: Normal
* ruby -v: 3.0.3
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
IO's and StringIO's `#each` method (and similar ones - `#gets`, `#readline` etc) behave in a different way in the following case:
- separator is `nil`
- limit is passed
- `chomp: true` passed

In this case `StringIO#each` removes trailing `\n` but `IO#each` does not:

```ruby
StringIO.new("abc\n\ndef\n").each(nil, 2, chomp: true).to_a
#=> ["ab", "c", "\nd", "ef", ""]

File.open('chomp.txt').each(nil, 2, chomp: true).to_a
#=> ["ab", "c\n", "\nd", "ef", "\n"]
```

The file has the same content:

```ruby
File.read('chomp.txt');
#=> "abc\n\ndef\n"
```

Expected behavior - both methods return the same result.



-- 
https://bugs.ruby-lang.org/

Unsubscribe: <mailto:ruby-core-request@ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>