[#35631] [Ruby 1.9 - Bug #4558][Open] TestSocket#test_closed_read fails after r31230 — Tomoyuki Chikanaga <redmine@...>

23 messages 2011/04/06

[#35632] [Ruby 1.9 - Bug #4559][Open] Proc#== does not match the documented behaviour — Adam Prescott <redmine@...>

13 messages 2011/04/06

[#35637] [Ruby 1.9 - Bug #4561][Open] 1.9.2 requires parentheses around argument of method call in an array, where 1.8.7 did not — Dave Schweisguth <redmine@...>

9 messages 2011/04/07

[#35734] [Ruby 1.9 - Feature #4574][Open] Numeric#within — redmine@...

16 messages 2011/04/13

[#35753] [Ruby 1.9 - Bug #4576][Open] Range#step miss the last value, if end-exclusive and has float number — redmine@...

61 messages 2011/04/14
[#39566] [Ruby 1.9 - Bug #4576] Range#step miss the last value, if end-exclusive and has float number — Marc-Andre Lafortune <ruby-core@...> 2011/09/15

[#39590] [Ruby 1.9 - Bug #4576] Range#step miss the last value, if end-exclusive and has float number — Marc-Andre Lafortune <ruby-core@...> 2011/09/16

[#39593] Re: [Ruby 1.9 - Bug #4576] Range#step miss the last value, if end-exclusive and has float number — Tanaka Akira <akr@...> 2011/09/16

2011/9/17 Marc-Andre Lafortune <[email protected]>:

[#39608] Re: [Ruby 1.9 - Bug #4576] Range#step miss the last value, if end-exclusive and has float number — Masahiro TANAKA <masa16.tanaka@...> 2011/09/17

I have not been watching ruby-core, but let me give a comment for this issu=

[#35765] [Ruby 1.9 - Bug #4579][Open] SecureRandom + OpenSSL may repeat with fork — redmine@...

27 messages 2011/04/15

[#35866] [Ruby 1.9 - Bug #4603][Open] lib/csv.rb: when the :encoding parameter is not provided, the encoding of CSV data is treated as ASCII-8BIT — yu nobuoka <nobuoka@...>

13 messages 2011/04/24

[#35879] [Ruby 1.9 - Bug #4610][Open] Proc#curry behavior is inconsistent with lambdas containing default argument values — Joshua Ballanco <jballanc@...>

11 messages 2011/04/25

[#35883] [Ruby 1.9 - Bug #4611][Open] [BUG] Segementation fault reported — Deryl Doucette <me@...>

15 messages 2011/04/25

[#35895] [Ruby 1.9 - Feature #4614][Open] [RFC/PATCH] thread_pthread.c: lower RUBY_STACK_MIN_LIMIT to 64K — Eric Wong <normalperson@...>

10 messages 2011/04/25

[ruby-core:35864] [Ruby 1.9 - Feature #4539] Array#zip_with

From: Jeremy Voorhis <jvoorhis@...>
Date: 2011-04-24 04:01:12 UTC
List: ruby-core #35864
Issue #4539 has been updated by Jeremy Voorhis.


I think it's worth having Enumerable#zip_with as a new public method. zip_with is the generalization of zip (you can define zip = zipWIth (,) in Haskell). Because zip_with can be implemented directly via inject, it's possible to provide an implementation with a lower complexity than zip composed with map. With respect to the comment about a method ending in a preposition, the Haskell standard provides a good precedent, and a worthy addition to the collection of languages that influenced Ruby.
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Feature #4539: Array#zip_with
http://redmine.ruby-lang.org/issues/4539

Author: Michael Kohl
Status: Assigned
Priority: Normal
Assignee: Yukihiro Matsumoto
Category: core
Target version: 


Inspired by Haskell's ((|zipWith|)) function, I hacked on together for Ruby:

 [1,2,3].zip_with([6,5,4], :+) #=> [7, 7, 7]
 [1,2,3].zip_with([6,5,4]) { |a,b| 3*a+2*b } #=> [15, 16, 17]

So far I only have a Ruby version of it:

https://gist.github.com/731702b90757e21cadcb

My questions:

1. Would this method be considered a worthwhile addition to Array?

2. I've never hacked on the C side of Ruby (read some parts of the source though) and my C is quite rusty. I'd like to change that, would somebody be willing to help me turn this into a proper patch?


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