[#387246] newbie question — sunny parker <info@2020proj.com>

i am coming from php and dont seem to quite understand how ruby works

13 messages 2011/09/01

[#387330] installing naive bayes classifier — aya abdelsalam <ayoya_91@...>

Hello

10 messages 2011/09/02

[#387344] Beginner needing help - Writing right-angle triangle program — Kane Williams <theburrick@...>

I've been going through a Haskell tutorial (Just to see what it's like)

12 messages 2011/09/03

[#387356] Which version should I download? — Vladimir Van Bauenhoffer <cluny_gisslaren@...>

Im new to programming and Im thinking of downloading and starting with

17 messages 2011/09/03

[#387392] loops problem — jack jones <shehio_22@...>

for (j = @array.length ; j > counter ; j = j-1) # counter is a variable

13 messages 2011/09/04

[#387469] posts on Unix systems programming — Eric Wong <normalperson@...>

I would like to do a series of mailing list posts on the subject of Unix

28 messages 2011/09/06

[#387530] Unexpected behavior of Ruby array — Suvankar Satpati <suvankar.17@...>

I was going through the exercises at http://rubykoans.com/ and got

11 messages 2011/09/08

[#387544] Executing the output of a look — dwight schrute <spambocks@...>

Hi,

14 messages 2011/09/08

[#387586] Creating a hash from two arrays — simon harrison <simonharrison.uk@...>

Hi. Can anyone help with this? I'd like to end with a hash like so:

15 messages 2011/09/09

[#387596] newbie ruby installation malloc issue — "mark e." <mark_f_edwards@...>

hi all -

12 messages 2011/09/09

[#387614] how to write data in binary to a file? — frank hi <yw_hi@163.com>

Hi,

11 messages 2011/09/10

[#387646] How do I make output generate a float without an excess numbers of decimal places? — Kane Williams <theburrick@...>

For example, my current code is

11 messages 2011/09/11

[#387725] Any downsides to writing paranthesises? — Vladimir Van Bauenhoffer <cluny_gisslaren@...>

Im a newbie programmer who is trying to learn Ruby after having just

18 messages 2011/09/12

[#387811] Get interpreter path — Michal Suchanek <hramrach@...>

Hello,

26 messages 2011/09/14
[#387842] Re: Get interpreter path — Phillip Gawlowski <cmdjackryan@...> 2011/09/14

On Wed, Sep 14, 2011 at 3:35 PM, Michal Suchanek <hramrach@centrum.cz> wrot=

[#387844] Re: Get interpreter path — Michal Suchanek <hramrach@...> 2011/09/14

On 14 September 2011 20:47, Phillip Gawlowski <cmdjackryan@gmail.com> wrote:

[#387814] Tough Ruby Homework — Rory Pascua <rorypascua@...>

I'm trying to take a long piece of text, find a word, and get that word

18 messages 2011/09/14

[#387853] Can I Safely Use Rubinius While Learning? — Aaron Jackson <jacksonaaronc@...>

Greetings,

18 messages 2011/09/15

[#387915] Some newbie questions — Vladimir Van Bauenhoffer <cluny_gisslaren@...>

I got some newbie questions which I would very much appreciate if

14 messages 2011/09/15

[#388003] Ruby Speed Question — Kevin Anon <oblivious.sage@...>

Wrote my first Ruby program recently for a class assignment where we had

12 messages 2011/09/18

[#388078] appending \n to each element in an array — Joe Collins <joec_49@...>

I have an array

13 messages 2011/09/20

[#388123] Turning on a special program at special time and turning off the computer at another special time — "amir e." <aef1370@...>

I decided to write a program in RUBY wherein these items have been done

11 messages 2011/09/21
[#388124] Re: Turning on a special program at special time and turning off the computer at another special time — andrew mcelroy <sophrinix@...> 2011/09/21

That sounds like a program a special program a terrorist would write. Are

[#388198] Conditional statements with multiple arguments — "Thomas B." <sinixlol@...>

Good afternoon everyone,

18 messages 2011/09/24

[#388203] Ruby 1.9.3 RC1 is out — "Yuki Sonoda (Yugui)" <yugui@...>

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19 messages 2011/09/24
[#388208] Re: [ANN] Ruby 1.9.3 RC1 is out — Quintus <sutniuq@...> 2011/09/24

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[#388209] Re: [ANN] Ruby 1.9.3 RC1 is out — Chris White <cwprogram@...> 2011/09/24

[#388214] Re: [ANN] Ruby 1.9.3 RC1 is out — Quintus <sutniuq@...> 2011/09/24

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[#388216] Re: [ANN] Ruby 1.9.3 RC1 is out — Yusuke Endoh <mame@...> 2011/09/24

Hello,

[#388248] Looking for better/familiar approach to command line opts — "Perl J." <perljunkie@...>

So I guess the warning to the reader upfront is... I'm a bit of a Perl

14 messages 2011/09/25

[#388333] Get all classes from a list of files — Jeroen van Ingen <jeroeningen@...>

I have a list of ruby files. I would like to create objects from all

11 messages 2011/09/28

[#388342] Ruby Syntax @keywords ||= [ ] — Bhavesh Sharma <sharmabhavesh@...>

Sorry if this comes across as a dumb question, but what does the

11 messages 2011/09/28

[#388366] IO.readlines will not accept variable with file name Why? — Joda jenson <jodajen2@...>

I am fairly new to Ruby and I am stuck on this. Would someone have a

13 messages 2011/09/29
[#388368] Re: IO.readlines will not accept variable with file name Why? — Robert Klemme <shortcutter@...> 2011/09/29

On Thu, Sep 29, 2011 at 11:14 AM, Joda jenson <jodajen2@yahoo.com> wrote:

Re: Creating a hash from two arrays

From: Chris White <cwprogram@...>
Date: 2011-09-09 17:05:15 UTC
List: ruby-talk #387587
> Hi. Can anyone help with this? I'd like to end with a hash like so:
>=A0
> hash =3D {{"A" =3D> 'alpha'}=2C {'B' =3D> 'bravo'}} etc...
>=A0
>=A0
>=A0
> I'm not sure whether I can use group_by and how to handle case
> insensitity. Cheers for any help.
>=A0
>=A0
>=A0
> irb(main):001:0> s =3D ('A'..'Z').to_a
> =3D> ["A"=2C "B"=2C "C"=2C "D"=2C "E"=2C "F"=2C "G"=2C "H"=2C "I"=2C "J"=
=2C "K"=2C "L"=2C "M"=2C
> "N"=2C "O"=2C "P"=2C "Q"=2C "R"=2C "S"=2C "T"=2C "U"=2C "V"=2C "W"=2C "X"=
=2C "Y"=2C "Z"]
>=A0
> irb(main):003:0> t =3D %w(alpha bravo Charlie Zebra)
> =3D> ["alpha"=2C "bravo"=2C "Charlie"=2C "Zebra"]
I will suggest something different based on what you wish to do. This uses =
inject:
---t =3D %w(alpha bravo Charlie Zebra)
result =3D t.inject(Hash.new) do | words=2C word |=A0 first_letter =3D word=
[0].upcase=A0 words[first_letter] =3D word=A0 wordsend---
result looks like this:
{"A"=3D>"alpha"=2C "B"=3D>"bravo"=2C "C"=3D>"Charlie"=2C "Z"=3D>"Zebra"}=A0
Now=2C if there's a chance that words with start with the letter A=2C or an=
y other letter might occur=2C I instead recommend an array based approach:
---t =3D %w(alpha bravo Charlie Zebra)
result =3D t.inject(Hash.new) do | words=2Cword |=A0 first_letter =3D word[=
0].upcase=A0 if words.has_key? first_letter=A0 =A0 words[first_letter] << w=
ord=A0 else=A0 =A0 words[first_letter] =3D [word]=A0 end=A0 wordsend---
result produces:
{"A"=3D>["alpha"]=2C "B"=3D>["bravo"]=2C "C"=3D>["Charlie"]=2C "Z"=3D>["Zeb=
ra"]} =A0
In both cases=2C the first letter is uppercased to handle being case insens=
itive. Let me know if you have any questions regarding this=2C or if you ha=
ve a different problem you are trying to solve.
Best Regards=2CChris White 		 	   		  =

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