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Issue #5133 has been updated by duerst (Martin Dürst).
In issue #20336, @matheusrich wrote:
```
* [Feature #5133] Array#unzip as an alias of Array#transpose
* Seems a more friendly name for this method (easier if you don't have a strong math background)
* It is nice that we can do an operation an reverse it with two similar-named methods:
```rb
[1, 2, 3, 4].zip(["a", "b", "c", "d"], ["I", "II", "III", "IV"])
# => [[[1, "a"], "I"], [[2, "b"], "II"], [[3, "c"], "III"], [[4, "d"], "IV"]]
[[[1, "a"], "I"], [[2, "b"], "II"], [[3, "c"], "III"], [[4, "d"], "IV"]].unzip
# => [[1, 2, 3, 4], ["a", "b", "c", "d"], ["I", "II", "III", "IV"]]
```
It's already alluded in some of the comments above: `transpose` is it's own inverse, so if we define `unzip` as an alias for `transpose`, `unzip` will be its own inverse.
The reason Haskell has `zip`/`unzip` as inverses is that `zip` in Haskell converts from two lists to a list of pairs, and `unzip` converts from a list of pairs to a pair of lists. In Haskell, `zip` and `unzip` are inverses (up to (un)currying).
In Haskell, the arguments of `zip` are limited to two lists. In Ruby, it's one array as receiver and one or more arrays as arguments. For `transpose`, it's an array of arrays. Only the later is fully generic and thus can be made exactly invertible.
----------------------------------------
Feature #5133: Array#unzip as an alias of Array#transpose
https://bugs.ruby-lang.org/issues/5133#change-107431
* Author: mrkn (Kenta Murata)
* Status: Assigned
* Assignee: mrkn (Kenta Murata)
----------------------------------------
Array#zip の逆は Array#transpose なんですけど、
この対応関係が非常に分かり難いなと思いました。
Haskell には zip の逆をやる関数として unzip が用意されています。
unzip という名前は、「zip の逆をやりたい」と思ったときに
(transpose よりは) 思い付きやすい名前だと思います。
ということで Array#unzip を Array#transpose のエイリアスとして
導入してはどうでしょう?
以下パッチです:
diff --git a/array.c b/array.c
index 8caad66..dc411b7 100644
--- a/array.c
+++ b/array.c
@@ -4720,6 +4720,7 @@ Init_Array(void)
rb_define_method(rb_cArray, "reject!", rb_ary_reject_bang, 0);
rb_define_method(rb_cArray, "zip", rb_ary_zip, -1);
rb_define_method(rb_cArray, "transpose", rb_ary_transpose, 0);
+ rb_define_alias(rb_cArray, "unzip", "transpose");
rb_define_method(rb_cArray, "replace", rb_ary_replace, 1);
rb_define_method(rb_cArray, "clear", rb_ary_clear, 0);
rb_define_method(rb_cArray, "fill", rb_ary_fill, -1);
--
https://bugs.ruby-lang.org/
Issue #20311 has been reported by MaxLap (Maxime Lapointe).
----------------------------------------
Bug #20311: Struct.new("A") memory leak?
https://bugs.ruby-lang.org/issues/20311
* Author: MaxLap (Maxime Lapointe)
* Status: Open
* ruby -v: 3.3.0
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
The following code gives the impression of a memory leak.
```
10.times do
5000.times do
Struct.new("A")
Struct.send(:remove_const, :A)
end
GC.start
puts `ps -o rss= -p #{$$}`.to_i
end
```
```
27868
35324
43400
51472
58676
66144
73764
81196
88512
95752
```
Is there another location where the struct gets set that I need to clear up for the GC free the memory?
Happens in 3.2.2, 3.2.3, 3.3.0, 3.3-head, ruby-head.
--
https://bugs.ruby-lang.org/
Issue #6317 has been updated by matheusrich (Matheus Richard).
@mame @naruse This currently works on Ruby. Can we close this as completed?
----------------------------------------
Feature #6317: Range#cover?の引数としてRangeインスタンスを受けられるようにして欲しい
https://bugs.ruby-lang.org/issues/6317#change-107335
* Author: masaakiaoyagi (Masaaki Aoyagi)
* Status: Assigned
* Assignee: matz (Yukihiro Matsumoto)
----------------------------------------
青柳と申します。
以下のように、Range#cover?の引数としてRangeインスタンスを
受けられるようにして欲しいです。
(1..4).cover?(2..3) # => true
(1..4).cover?(0..3) # => false
取り敢えず実装してみましたので、添付いたします。
---Files--------------------------------
range_cover.diff (2.17 KB)
--
https://bugs.ruby-lang.org/
Issue #16297 has been updated by jhawthorn (John Hawthorn).
I'm not sure if there's a deeper problem this causes, but it is still possible after this patch to call the allocator on a Rational through defining an arbitrary `allocate` method.
``` ruby
>> def Rational.allocate; end
=> :allocate
>> Class.instance_method(:allocate).bind_call(Rational)
=> (0/1)
```
----------------------------------------
Bug #16297: calling undefined allocator by `Class.instance_method(:allocate)`
https://bugs.ruby-lang.org/issues/16297#change-107083
* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* Backport: 2.5: REQUIRED, 2.6: DONE
----------------------------------------
For instance, `Rational.allocate` is undefined.
```ruby
Rational.allocate #=> undefined method `allocate' for Rational:Class (NoMethodError)
```
But it can be called by `Class.instance_method(:allocate)`.
```ruby
Class.instance_method(:allocate).bind_call(Rational) #=> (0/1)
Class.instance_method(:allocate).bind(Rational).call #=> (0/1)
```
These allocators are defined for Marshal, and undefined as methods.
--
https://bugs.ruby-lang.org/