From: "zzak (Zachary Scott)" <zachary@zacharyscott•net>
To: ruby-dev@ruby-lang.org (ruby developers list)
Subject: [ruby-dev:47225] [ruby-trunk - Feature #7877] E::Lazy#with_index needed
Date: Fri, 5 Apr 2013 11:32:41 +0900 [thread overview]
Message-ID: <redmine.journal-38245.20130405113240@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-7877.20130218202740@ruby-lang.org
Issue #7877 has been updated by zzak (Zachary Scott).
Propose to move this to next major?
----------------------------------------
Feature #7877: E::Lazy#with_index needed
https://bugs.ruby-lang.org/issues/7877#change-38245
Author: shyouhei (Shyouhei Urabe)
Status: Assigned
Priority: Normal
Assignee: yhara (Yutaka HARA)
Category: core
Target version: next minor
=begin
So I wanted some real benefit of being lazy. I wrote a Leibniz formula:
def leibniz(n)
(0..Float::INFINITY).lazy.with_index {|i, j| (-1 ** j) / (2*i+1).to_f }.take(n).reduce(:+)
end
But it doesn't work (well, it does, indeed. It just doesn't stop working). I got frustrated.
How about it? Don't you feel it nifty?
Of course I can wait for the release next to 2.0.0.
=end
--
http://bugs.ruby-lang.org/
next prev parent reply other threads:[~2013-04-05 2:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <redmine.issue-7877.20130218202740@ruby-lang.org>
2013-02-19 6:26 ` [ruby-dev:47045] [ruby-trunk - Feature #7877] E::Lazy#with_index needed nobu (Nobuyoshi Nakada)
2013-02-19 7:17 ` [ruby-dev:47046] " marcandre (Marc-Andre Lafortune)
2013-02-19 11:43 ` [ruby-dev:47047] " shyouhei (Shyouhei Urabe)
2013-02-19 16:30 ` [ruby-dev:47050] " marcandre (Marc-Andre Lafortune)
2013-02-20 6:01 ` [ruby-dev:47056] " shyouhei (Shyouhei Urabe)
2013-04-05 2:32 ` zzak (Zachary Scott) [this message]
2013-04-05 4:21 ` [ruby-dev:47226] " duerst (Martin Dürst)
2013-06-02 5:50 ` [ruby-dev:47390] " zzak (Zachary Scott)
2013-06-02 7:31 ` [ruby-dev:47392] [ruby-trunk - Bug #7877] E::Lazy#with_index should be lazy zzak (Zachary Scott)
2014-01-30 6:16 ` [ruby-dev:47932] " shibata.hiroshi
2014-07-16 14:03 ` [ruby-dev:48412] " nakilon
2016-08-08 1:59 ` [ruby-dev:49751] [Ruby trunk Bug#7877] " shyouhei
2016-10-11 7:18 ` [ruby-dev:49834] " shyouhei
2019-08-08 20:45 ` [ruby-dev:50829] [Ruby master " merch-redmine
2019-08-09 8:07 ` [ruby-dev:50831] " nobu
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