[#377882] remove array bracket — Kamarulnizam Rahim <niezam54@...>

Hi when i run my script, the output is as followed:

18 messages 2011/02/02

[#378046] Setter method for Hash value — Rolf Pedersen <rolfhsp@...>

Hi

20 messages 2011/02/03
[#378052] Re: Setter method for Hash value — Brian Candler <b.candler@...> 2011/02/03

Rolf Pedersen wrote in post #979431:

[#378056] Re: Setter method for Hash value — Rolf Pedersen <rolfhsp@...> 2011/02/03

Hi Brian (and others who have contributed with suggestions along the same

[#378144] C extension: How to check if a VALUE is still alive (not being GC'ed)? — Iñaki Baz Castillo <ibc@...>

Hi, I'm coding an async DNS resolver for EventMachine based on udns (a

13 messages 2011/02/05
[#378171] Re: C extension: How to check if a VALUE is still alive (not being GC'ed)? — Tony Arcieri <tony.arcieri@...> 2011/02/06

On Sat, Feb 5, 2011 at 4:02 PM, I=F1aki Baz Castillo <ibc@aliax.net> wrote:

[#378179] Re: C extension: How to check if a VALUE is still alive (not being GC'ed)? — Iñaki Baz Castillo <ibc@...> 2011/02/06

2011/2/6 Tony Arcieri <tony.arcieri@medioh.com>:

[#378199] Choosing an office suite — Hilary Bailey <my77elephants@...>

I am trying to decide which office suite to choose from. The only

30 messages 2011/02/07
[#378229] Re: Choosing an office suite — Phillip Gawlowski <cmdjackryan@...> 2011/02/07

On Mon, Feb 7, 2011 at 11:15 AM, Hilary Bailey <my77elephants@gmail.com> wrote:

[#378202] making hash key from arrays — Arihan Sinha <arihan_sinha@...>

Hi All,

11 messages 2011/02/07

[#378254] "permission denied" happening too often — Peter Bailey <pbailey@...>

Hello,

15 messages 2011/02/08
[#378256] Re: "permission denied" happening too often — Anurag Priyam <anurag08priyam@...> 2011/02/08

> I've got Ruby scripts that have been working fine for years now. But,

[#378257] Re: "permission denied" happening too often — Markus Schirp <mbj@...> 2011/02/08

You can also try to strace your script. In the logs you'll find the system

[#378259] Re: "permission denied" happening too often — Peter Bailey <pbailey@...> 2011/02/08

Markus Schirp wrote in post #980289:

[#378307] undefined class/module YAML::PrivateType - Error — "Priya D." <dharsininitt@...>

Hi,

11 messages 2011/02/09

[#378341] System calls with ` in parameters — "Gerad S." <geradstemke@...>

Hi All,

12 messages 2011/02/09

[#378618] Defining class methods — Tony Arcieri <tony.arcieri@...>

It seems there are 3 ways of defining class methods (at least in common

12 messages 2011/02/16

[#378685] LiveAST: a pure Ruby 1.9.2 library obtaining live abstract syntax trees — "James M. Lawrence" <quixoticsycophant@...>

= LiveAST

13 messages 2011/02/18

[#378753] posix_mq : Problem installing on HPUX — Tadeusz Bochan <tad.bochan@...>

Hello,

13 messages 2011/02/20

[#378890] a, b = Array.new(2).map!{|x| data.dup} — Stefan Salewski <mail@...>

I think I can replace this code

19 messages 2011/02/23
[#378892] Re: a, b = Array.new(2).map!{|x| data.dup} — niklas | brueckenschlaeger <niklas@...> 2011/02/23

Are you sure you can't rework your code to *not* copy data 5x? I assume

[#378899] Re: a, b = Array.new(2).map!{|x| data.dup} — Stefan Salewski <mail@...> 2011/02/23

On Thu, 2011-02-24 at 07:00 +0900, niklas | brueckenschlaeger wrote:

[#378941] Automatic question generator libs in Ruby Language — Sniper Abandon <sathish.salem.1984@...>

is there any Automatic question generator libraries in Ruby Language ?

20 messages 2011/02/24
[#379058] Re: Automatic question generator libs in Ruby Language — Sniper Abandon <sathish.salem.1984@...> 2011/02/27

suppose if i have a paragraph (arround 250 words)

[#379172] Re: Automatic question generator libs in Ruby Language — Shadowfirebird <shadowfirebird@...> 2011/03/01

> i want to get all the possible question from that paragraph

[#379174] Re: Automatic question generator libs in Ruby Language — Peter Zotov <whitequark@...> 2011/03/01

On Tue, 1 Mar 2011 19:31:36 +0900, Shadowfirebird wrote:

[#379175] Re: Automatic question generator libs in Ruby Language — Adam Prescott <mentionuse@...> 2011/03/01

On Tue, Mar 1, 2011 at 10:55 AM, Peter Zotov <whitequark@whitequark.org>wrote:

[#379177] Re: Automatic question generator libs in Ruby Language — Peter Zotov <whitequark@...> 2011/03/01

On Tue, 1 Mar 2011 20:02:13 +0900, Adam Prescott wrote:

[#379179] Re: Automatic question generator libs in Ruby Language — Adam Prescott <mentionuse@...> 2011/03/01

On Tue, Mar 1, 2011 at 12:28 PM, Peter Zotov <whitequark@whitequark.org>wrote:

[#378949] why is $1 in a grep() equal to nil? — 7stud -- <bbxx789_05ss@...>

class DataSource

16 messages 2011/02/24
[#378953] Re: why is $1 in a grep() equal to nil? — Eric Christopherson <echristopherson@...> 2011/02/25

On Thu, Feb 24, 2011 at 2:59 PM, 7stud -- <bbxx789_05ss@yahoo.com> wrote:

[#378958] parsing rule for this code? — 7stud -- <bbxx789_05ss@...>

1)

11 messages 2011/02/25

[#379000] Symbol#to_proc helping out with #select to beat Scala-s solution — Jarmo Pertman <jarmo.p@...>

Hey!

9 messages 2011/02/25

[#379074] finding a tag in a binary file — rob stanton <tnotnats@...>

I have a binary file in which I'd like to find multiple strings of 10

12 messages 2011/02/27

Re: Group elements by category

From: Sergi Villanueva <svillanueva@...>
Date: 2011-02-02 08:35:41 UTC
List: ruby-talk #377906
On Jan 28, 4:43=A0pm, Adam Prescott <mention...@gmail.com> wrote:
> [Note: =A0parts of this message were removed to make it a legal post.]
>
> On Fri, Jan 28, 2011 at 2:44 PM, Anurag Priyam <anurag08pri...@gmail.com>=
wrote:
>
> > >> foo =3D [1, 2, 2, 3, 3, 3, 4, 4, 4, 4]
> > >> groups =3D Hash.new{|h, k| h[k] =3D []}
> > >> foo.each{|i| groups[i] << i}
>
> > >> groups =A0 =A0 =3D> {1=3D>[1], 2=3D>[2, 2], 3=3D>[3, 3, 3], 4=3D>[4,=
 4, 4, 4]}
> > >> groups[3] =3D> [3, 3, 3]
>
> I think Rails provides this method for pre-1.8.7, but for 1.8.7 and highe=
r
> you can use group_by:
>
> >> (1..10).group_by { |n| n % 2 }
>
> =3D> {0=3D>[2, 4, 6, 8, 10], 1=3D>[1, 3, 5, 7, 9]}
>
> which is more easily generalised than the quoted code's approach, and eas=
ier
> to read, certainly. As an exercise, maybe try implementing your own
> Enumerable#group_by method; it's good for getting your head around how #e=
ach
> and mixins work, as well as yielding to blocks.

Many thanks!

what i finally did :

%w(category_1 category_2 category_3).map{|c| ls.select{|li|
li.category =3D=3D c}}

where ls are all the elements i need to group.. anyway, the native
rails group_by method is much better, i didnt know it exists!

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