From: sawadatsuyoshi@...
Date: 2019-02-06T14:32:01+00:00
Subject: [ruby-core:91435] [Ruby trunk Feature#15588] String#each_chunk and	#chunks

Issue #15588 has been updated by sawa (Tsuyoshi Sawada).


I am also not so sure if this feature is needed. But if I wanted such feature, I would ask to let `String#scan` take similar arguments as `String#[]`. That is, let the first argument point to the starting position, and an optional second argument to be the length. Since we want to capture multiple matches unlike with `[]`, passing a single index for the first argument does not make much sense, but now we have `Enumerator::ArithmeticSequence`. So we should be able to do

```ruby
str.scan((0..).step(9)) #=> ["20190101 ", "20190102\n", "20190103 ", "20190104\n"]
str.scan((0..).step(9), 8) #=> ["20190101", "20190102", "20190103", "20190104"]
```


----------------------------------------
Feature #15588: String#each_chunk and #chunks
https://bugs.ruby-lang.org/issues/15588#change-76694

* Author: Glass_saga (Masaki Matsushita)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 2.7
----------------------------------------
String#each_chunk iterates chunks of specified size in String.
String#chunks is a shorthand for str.each_chunk(n).to_a.

present:
```ruby
str = <<EOS
20190101 20190102
20190103 20190104
EOS

str.scan(/.{1,9}/m) do |chunk|
  p chunk #=> "20190101 "
end

str.scan(/.{1,9}/m) do |chunk|
  chunk.strip!
  p chunk #=> "20190101"
end

str.scan(/.{1,9}/m) #=> ["20190101 ", "20190102\n", "20190103 ", "20190104\n"]
str.scan(/.{1,9}/m).map(&:strip) #=> ["20190101", "20190102", "20190103", "20190104"]
```

proposal:
```ruby
str = <<EOS
20190101 20190102
20190103 20190104
EOS

str.each_chunk(9) do |chunk|
  p chunk #=> "20190101 "
end

str.each_chunk(9, strip: true) do |chunk|
  p chunk #=> "20190101"
end

str.chunks(9) #=> ["20190101 ", "20190102\n", "20190103 ", "20190104\n"]
str.chunks(9, strip: true) #=> ["20190101", "20190102", "20190103", "20190104"]
```

---Files--------------------------------
patch.diff (6.56 KB)


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