[#115244] [Ruby master Feature#19987] add sample method to Range — "horv77@... (Andras Horvath) via ruby-core" <ruby-core@...>
Issue #19987 has been reported by horv77@protonmail.com (Andras Horvath).
6 messages
2023/11/05
[#115247] [Ruby master Feature#19988] AI for inner code behavior analysis at runtime — "horv77@... (Andras Horvath) via ruby-core" <ruby-core@...>
Issue #19988 has been reported by horv77@protonmail.com (Andras Horvath).
3 messages
2023/11/05
[#115404] Ruby 3.2.2 - rbconfig.rb's MAKEFILE_CONFIG — Jay Mav via ruby-core <ruby-core@...>
Hello Ruby Dev Team,
4 messages
2023/11/17
[ruby-core:115480] [Ruby master Feature#18368] Range#step semantics for non-Numeric ranges
From:
"zverok (Victor Shepelev) via ruby-core" <ruby-core@...>
Date:
2023-11-26 11:15:15 UTC
List:
ruby-core #115480
Issue #18368 has been updated by zverok (Victor Shepelev).
I am sorry that only now I had time to further work on the feature.
I understand it is almost Decemeber and the feature might not make it in the 3.3 (though I would be happy if it would).
The generic backward iteration was implemented:
```ruby
(Time.utc(2022, 3, 1)..Time.utc(2022, 2, 24)).step(-24*60*60) { puts _1 }
# Prints:
# 2022-03-01 00:00:00 UTC
# 2022-02-28 00:00:00 UTC
# 2022-02-27 00:00:00 UTC
# 2022-02-26 00:00:00 UTC
# 2022-02-25 00:00:00 UTC
# 2022-02-24 00:00:00 UTC
```
The coercion for numeric values and custom objects works as expected:
```ruby
val = Struct.new(:val) do
def coerce(num) = [num, val]
end
p (1..3).step(val.new(1)).to_a
# => [1, 2, 3]
```
So I believe the feature is ready for the final review/merge.
Two nuances I am currently aware of:
**1. I didn't change the behavior of numeric iteration, but it might be considered inconsistent:**
```ruby
(1r..).step(1).take(3)
#=> [(1/1), 2.0, 3.0]
(1r..).step(1.0).take(3)
#=> [1.0, 2.0, 3.0]
```
One might expect that those examples would return `[1r, 2r, 3r]`, but **that's how it always worked**.
**2. The `rbs` tests are [broken](https://github.com/ruby/ruby/actions/runs/6994686558/job/19028728347?pr=7444)**
That's not because the RBS itself is broken by the change, but because one of the tests [uses](https://github.com/ruby/rbs/blob/master/test/stdlib/Range_test.rb#L106-L107) string range with the default and numeric steps, which are now incorrect. I don't think it represents some realistic use case, and RBS tests should be fixed.
I will be grateful for the instruction how to do that (I mean, what's the process to adjust bundled gem's tests that became irrelevant for the new Ruby version).
----------------------------------------
Feature #18368: Range#step semantics for non-Numeric ranges
https://bugs.ruby-lang.org/issues/18368#change-105411
* Author: zverok (Victor Shepelev)
* Status: Open
* Priority: Normal
----------------------------------------
I am sorry if the question had already been discussed, can't find the relevant topic.
"Intuitively", this looks (for me) like a meaningful statement:
```ruby
(Time.parse('2021-12-01')..Time.parse('2021-12-24')).step(1.day).to_a
# ^^^^^ or just 24*60*60
```
Unfortunately, it doesn't work with "TypeError (can't iterate from Time)".
Initially it looked like a bug for me, but after digging a bit into code/docs, I understood that `Range#step` has an odd semantics of "advance the begin N times with `#succ`, and yield the result", with N being always integer:
```ruby
('a'..'z').step(3).first(5)
# => ["a", "d", "g", "j", "m"]
```
The fact that semantic is "odd" is confirmed by the fact that for Float it is redefined to do what I "intuitively" expected:
```ruby
(1.0..7.0).step(0.3).first(5)
# => [1.0, 1.3, 1.6, 1.9, 2.2]
```
(Like with [`Range#===` some time ago](https://bugs.ruby-lang.org/issues/14575), I believe that to be a strong proof of the wrong generic semantics, if for numbers the semantics needed to be redefined completely.)
Another thing to note is that "skip N elements" seem to be rather "generically Enumerable-related" yet it isn't defined on `Enumerable` (because nobody needs this semantics, typically!)
Hence, two questions:
* Can we redefine generic `Range#step` to new semantics (of using `begin + step` iteratively)? It is hard to imagine the amount of actual usage of the old behavior (with String?.. to what end?) in the wild
* If the answer is "no", can we define a new method with new semantics, like, IDK, `Range#over(span)`?
**UPD:** More examples of useful behavior (it is NOT only about core `Time` class):
```ruby
require 'active_support/all'
(1.minute..20.minutes).step(2.minutes).to_a
#=> [1 minute, 3 minutes, 5 minutes, 7 minutes, 9 minutes, 11 minutes, 13 minutes, 15 minutes, 17 minutes, 19 minutes]
require 'tod'
(Tod::TimeOfDay.parse("8am")..Tod::TimeOfDay.parse("10am")).step(30.minutes).to_a
#=> [#<Tod::TimeOfDay 08:00:00>, #<Tod::TimeOfDay 08:30:00>, #<Tod::TimeOfDay 09:00:00>, #<Tod::TimeOfDay 09:30:00>, #<Tod::TimeOfDay 10:00:00>]
require 'matrix'
(Vector[1, 2, 3]..).step(Vector[1, 1, 1]).take(3)
#=> [Vector[1, 2, 3], Vector[2, 3, 4], Vector[3, 4, 5]]
require 'unitwise'
(Unitwise(0, 'km')..Unitwise(1, 'km')).step(Unitwise(100, 'm')).map(&:to_s)
#=> ["0 km", "1/10 km", "1/5 km", "3/10 km", "2/5 km", "0.5 km", "3/5 km", "7/10 km", "4/5 km", "9/10 km", "1 km"]
```
**UPD:** Responding to discussion points:
**Q:** Matz is concerned that the proposed simple definition will be confusing with the classes where `+` is redefined as concatenation.
**A:** I believe that simplicity of semantics and ease of explaining ("it just uses `+` underneath, whatever `+` does, will be performed") will make the confusion minimal.
**Q:** Why not introduce new API requirement (like "class of range's `begin` should implement `increment` method, and then it will be used in `step`)
**A:** require *every* gem author to change *every* of their objects' behavior. For that, they should be aware of the change, consider it important enough to care, clearly understand the necessary semantics of implementation, have a resource to release a new version... Then all users of all such gems would be required to upgrade. The feature would be DOA (dead-on-arrival).
The two alternative ways I am suggesting: change the behavior of `#step` or introduce a new method with desired behavior:
1. Easy to explain and announce
2. Require no other code changes to immediately become useful
3. With something like [backports](https://github.com/marcandre/backports) or [ruby-next](https://github.com/ruby-next/ruby-next) easy to start using even in older Ruby version, making the code more expressive even before it would be possible for some particular app/compny to upgrade to (say) 3.2
All examples of behavior from the code above are real `irb` output with monkey-patched `Range#step`, demonstrating how little change will be needed to code outside of the `Range`.
--
https://bugs.ruby-lang.org/
______________________________________________
ruby-core mailing list -- ruby-core@ml.ruby-lang.org
To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org
ruby-core info -- https://ml.ruby-lang.org/mailman3/postorius/lists/ruby-core.ml.ruby-lang.org/