[#403748] Why Array#include? not working withone liner integer arrays? — Arup Rakshit <lists@...>
I was trying to write a one liner with integer array using
On 01/31/2013 11:01 PM, Arup Rakshit wrote:
[#403770] Novice: self, @self.respond_to? and dynamically built methods — Steve Tu <lists@...>
I have been plodding through a Ruby tutorial and came across the
Am 01.02.2013 12:36, schrieb Steve Tu:
[#403794] Enumeration vs Enumerable — Arup Rakshit <lists@...>
Can anyone explain what "Enumeration" is? What it does and when a
Hello,
Calvin B. wrote in post #1094810:
[#403802] IRB equivalent to windows cmd if any? — Arup Rakshit <lists@...>
I am currently using ruby 1.9.3. But till now i am using windows command
[#403830] Confusion with Enum#with_index — Arup Rakshit <lists@...>
I was playing to understand the method "Enum#with_index" with the below
[#403837] Why none of the block giving the expected output with the "enumerator"? — Arup Rakshit <lists@...>
Why none of the block giving the expected output with the "enumerator"?
On Sunday 03 February 2013 Arup Rakshit wrote
Stefano Crocco wrote in post #1094918:
On Sunday 03 February 2013 Arup Rakshit wrote
Stefano Crocco wrote in post #1094920:
[#403846] Open file that its name given by STDIN.gets — aref aslani <lists@...>
Hi all. I'm following the Zed Shaw's ruby tutorials.
[#403856] Class for data analysis: File.open once — Soichi Ishida <lists@...>
ruby 1.9.3p362 (2012-12-25 revision 38607) [x86_64-darwin12.2.1]
[#403857] Easy way to handle positional and hashed parameters on a method? — tamouse mailing lists <tamouse.lists@...>
Ideally, I'd like to be able to offer either of these on an API I'm creating:
[#403869] Storing string-data in a module — Marc Heiler <lists@...>
Hi.
[#403870] Confusion with Enum#with_object block argument construct — Arup Rakshit <lists@...>
C:\>irb
the array at with_object collects the elements but:
Hans Mackowiak wrote in post #1095038:
On 4 February 2013 17:02, Love U Ruby <lists@ruby-forum.com> wrote:
Matthew Kerwin wrote in post #1095078:
[#403883] couldn't hit a button using selenium-webdriver — Arup Rakshit <lists@...>
**Code:**
[#403890] Can we open a page in a new tab in the same browser using selenium-webdriver? — Arup Rakshit <lists@...>
driver = Selenium::WebDriver.for :firefox
[#403891] BrowserCMS demo project creation problem — "Tom C." <lists@...>
I hope this is the place to post this. If it's the Rails list, let me
[#403914] Nokogiri scraping multiple URLs — Barry Kavanagh <lists@...>
I am new to Ruby and Nokogiri so excuse my lack of knowledge. I am
[#403920] Character classes use in Ruby — Love U Ruby <lists@...>
Can anyone help me by giving an explanatory example of each of the
my-ruby:
Hans Mackowiak wrote in post #1095104:
[#403935] How to stop page loading using selenium-web driver? — Love U Ruby <lists@...>
How to stop page loading using selenium-web driver?
[#403945] Nokogiri - Data output not as expected — Barry Kavanagh <lists@...>
Sorry for bothering the forum about this but it is extremely
Thank you for your explanation Jesus but I am just not sure where to
On Mon, Feb 4, 2013 at 5:01 PM, Barry Kavanagh <lists@ruby-forum.com> wrote:
[#403964] Will we have ruby 2.0 before 1.8 dies? — Marc Heiler <lists@...>
Hi,
[#403969] How to increase flexibility of #flatten — Tom Stut <lists@...>
I am trying to use flatten to change
[#403972] Ruby could recognize the values when putting into a webpage text filed. — Love U Ruby <lists@...>
Hi,
how do you read the csv file?
Hans Mackowiak wrote in post #1095331:
I am just saying that the browser thinks the information it is receiving is
[#403975] Financial models using Ruby — Dwayne Henderson <its.code.in.here@...>
I'm working on this financial
[#403986] old syntax? what's going on here — tamouse mailing lists <tamouse.lists@...>
I have this in a _spec.rb file: (a gem I inherited at work)
Subject: old syntax? what's going on here
On Tue, Feb 5, 2013 at 7:47 AM, Carlo E. Prelz <fluido@fluido.as> wrote:
On Tue, Feb 5, 2013 at 7:52 AM, tamouse mailing lists
[#404005] Implementing DRY with a function call — Rob Marshall <lists@...>
Hi,
[#404006] using an instance variable inside a method — FirstName Surname <lists@...>
Hello.
I'm a couple weeks as a Ruby newby ... writing a fun puzzle and ran into
I see, i thought that you could use these accessors only outside the
On 6 February 2013 07:26, FirstName Surname <lists@ruby-forum.com> wrote:
[#404014] Is there anyway to get all the class with their instance methods names to be available and to see th — Love U Ruby <lists@...>
Is there anyway to get all the class with their instance methods names
[#404021] Not able get the label text incurred with <input> element — Love U Ruby <lists@...>
I do have a below `HTML`:
The text is in the div, not linked to the checkboxes. Looks like poorly
why not try it yourself? or read what others say:
I think this should do it:
Joel Pearson wrote in post #1095530:
[#404025] Symbol.defined? — Student Jr <lists@...>
Symbol deserialization from external sources is now known to be
[#404041] Expanding gemspecs — Jon Cairns <lists@...>
Hi everyone, I've got a question about the existence or potential
[#404047] unicorn 4.6.0 - Rack HTTP server for fast clients and Unix — Eric Wong <normalperson@...>
Unicorn is an HTTP server for Rack applications designed to only serve
[#404058] Ruby 1.9.3-p362 on Mac OSX — Peter Bailey <lists@...>
Hi,
The following:
Jon Cairns wrote in post #1095548:
On Wed, Feb 6, 2013 at 7:48 AM, Peter Bailey <lists@ruby-forum.com> wrote:
On 6 February 2013 15:48, Peter Bailey <lists@ruby-forum.com> wrote:
Jon Cairns wrote in post #1095551:
[#404082] Problem building Ruby 1.9.3 patchlevel 385 under AIX 7.1 — Ruby Student <ruby.student@...>
Hello World!
Anybody there? Anybody at all!
On Thu, Feb 28, 2013 at 6:43 AM, Ryan Davis <ryand-ruby@zenspider.com> wrote:
[#404094] How to pass established/defined arrays into def method. — Tom Stut <lists@...>
I am trying to pass a defined array into a method. Ruby is interpreting
On Wed, Feb 6, 2013 at 7:25 PM, Tom Stut <lists@ruby-forum.com> wrote:
[#404101] Issues from an extreme beginner — Bruce Palmer <lists@...>
Hey guys, great to be part of such a great community! I look forward to
Ahh, thank you Matthew! That was just the push I needed!
On Wed, Feb 6, 2013 at 10:43 PM, Bruce Palmer <lists@ruby-forum.com> wrote:
Hassan Schroeder wrote in post #1095774:
On 8 February 2013 06:39, Bruce Palmer <lists@ruby-forum.com> wrote:
on the side-track in case the name has only one character then the word
[#404113] how to skip lines whenever there is an error? — Love U Ruby <lists@...>
Hi,
Love U Ruby wrote in post #1095742:
[#404123] Why the speed? — Jesper Bukkehave <lists@...>
Attention!! Noob warning :)
[#404127] Help with the following program please — "Wayne E." <lists@...>
Can anyone help me put this program together. It is crucial.
On Thu, Feb 7, 2013 at 5:30 PM, Wayne E. <lists@ruby-forum.com> wrote:
I was trying to see if I could get some help on a few of the smaller
[#404183] Best way to interact with samba — Mauro Mauro <lists@...>
Hi all,
> I need to move some files from a linux to a widnows machine.
[#404189] New to ruby - need assistance with rewriting a script — Ronald Craft <lists@...>
Hello,
[#404208] elegant way to determine if something is defined — tamouse mailing lists <tamouse.lists@...>
Something like:
Subject: elegant way to determine if something is defined
On Sun, Feb 10, 2013 at 7:39 AM, Carlo E. Prelz <fluido@fluido.as> wrote:
Subject: Re: elegant way to determine if something is defined
On Mon, Feb 11, 2013 at 8:05 AM, Carlo E. Prelz <fluido@fluido.as> wrote:
On Sun, Feb 10, 2013 at 4:09 AM, tamouse mailing lists
[#404211] Why doesn't Ruby have a built in sandbox class? — Ano Hito <lists@...>
After having some trouble getting the j-ruby sandbox gem to work
On Sun, Feb 10, 2013 at 10:45 AM, Ano Hito <lists@ruby-forum.com> wrote:
Robert Klemme wrote in post #1096190:
I posted a strawman for something similar a few days ago. It's a bit
[#404218] Ruby Equivalent to VB's "With"? — Joel Pearson <lists@...>
I've looked around but I couldn't find anything helpful on this,
[#404231] firtst and only element of array (noob level) — Ronnie Aa <lists@...>
Hello people,
Am 11.02.2013 13:27 schrieb "Ronnie Aa" <lists@ruby-forum.com>:
Thomas Preymesser wrote in post #1096273:
Subject: Re: firtst and only element of array (noob level)
Carlo E. Prelz wrote in post #1096281:
[#404235] The "ruby way" to do desktop applications? — "guirec c." <lists@...>
Hello,
I've built a few simple desktop apps using Ruby, Tk, and Ocra.
For exemple, I want to create an application to manage a small business.
Subject: Re: The "ruby way" to do desktop applications?
[#404238] Best books for "advanced" programmers — "guirec c." <lists@...>
Hello,
@Dave Aronson
Good Books on Ruby functional programing - any reference?
Not necessarily Ruby, but gets you in the mindset: The little Schemer
[#404242] Playing with DSLs, a question or two — Peter Hickman <peterhickman386@...>
I am playing around with writing some DSLs to help me get more familier
[#404245] Issue with Excel column values read. — Love U Ruby <lists@...>
Hi,
And how many select lists do you use which take floats?
Joel Pearson wrote in post #1096351:
Looking at your previous example list, you're right you have a mixture. But the
Wayne Brisette wrote in post #1096356:
If you already know it has to be an integer, use ".to_i", or "Integer()"
[#404262] RDoc in latest version — RKA <roshkins@...>
Hello Kind people in Rubyland,
I think this is just a different "skin" or "theme" for RDoc. The command-line interface and the data is still the same; it's just displayed in a prettier way.
[#404280] How to see the all keys of "RbConfig::CONFIG" ? — Love U Ruby <lists@...>
How to see the all keys of "RbConfig::CONFIG" ?
[#404312] text include, searching using a part of the word, storing the whole word if found — Horváth Alex <lists@...>
Hey guys,
[#404344] Ruby command line options s and S — Love U Ruby <lists@...>
Can anyone help me to understand the difference between s and S with
On Wed, Feb 13, 2013 at 3:59 PM, Love U Ruby <lists@ruby-forum.com> wrote:
"Jes炭s Gabriel y Gal叩n" <jgabrielygalan@gmail.com> wrote in post
You can see the contents of the variable using echo:
[#404349] How to exit from the forever loop when using "-np" switch ? — Love U Ruby <lists@...>
I was trying to see the how they(-n,-p) works in ruby?
On Wed, Feb 13, 2013 at 4:55 PM, Love U Ruby <lists@ruby-forum.com> wrote:
Robert Klemme wrote in post #1096696:
[#404370] Confusion with Ruby command line options — Love U Ruby <lists@...>
Can any one help me to understand when and how to use the below two Ruby
[#404371] Error is coming with ruby commandline option "-d" — Love U Ruby <lists@...>
Hi,
That's simply what -d does – it prints all exceptions that ever happen in your code, even if they are rescued.
[#404372] file size of each item in file list — Sloan Ruby <lists@...>
I am trying to take the contents of a file which contains the results of
This is what I have now. I am not able to print out each line of the
On Wed, Feb 13, 2013 at 3:08 PM, Sloan Ruby <lists@ruby-forum.com> wrote:
[#404382] Can't load gems — Loran Kary <lists@...>
I have installed rvm on my Mac OSX and Ruby 1.9.3 and I also installed
Ryan Davis wrote in post #1096802:
[#404386] Re: Ruby command line options s and S — "D. Deryl Downey" <me@...>
Dude!
Humm!
On Thu, Feb 14, 2013 at 9:15 AM, Love U Ruby <lists@ruby-forum.com> wrote:
[#404387] Ruby Multithreaded producer-consumer problem — Abhijit Sarkar <lists@...>
Hi,
Subject: Ruby Multithreaded producer-consumer problem
Carlo E. Prelz wrote in post #1096828:
Bump!
On Sun, Feb 24, 2013 at 1:30 AM, Abhijit Sarkar <lists@ruby-forum.com> wrote:
First of all, Sean's modified version works!. It does not run into the
On Sun, Feb 24, 2013 at 4:51 PM, Abhijit Sarkar <lists@ruby-forum.com> wrote:
On Sun, Feb 24, 2013 at 4:23 PM, Robert Klemme
I rewrote the code using MonitorMixin and then back to using Mutex, same
Abhijit Sarkar wrote in post #1097009:
Love U Ruby wrote in post #1097084:
[#404407] Best DRY way to write bang versions of methods? — Joel Pearson <lists@...>
I've been wondering about the best way to quickly create a "bang"
[#404429] What are lambda functions used for? — Mike Glaz <lists@...>
I'm new to Ruby and lambda functions. I understand how they work but
[#404456] skip iteration in each loop — Saurav Chakraborty <lists@...>
I want to skip iteration for few values depending on dynamic condition.
[#404464] Ruby "visionary" code — Elr0ndK Asda <lists@...>
I found that code in the actual codebase of a web app I'm working on.
[#404485] Re: Ruby Multithreaded producer-consumer problem — "D. Deryl Downey" <me@...>
You don稚 get to start telling people that after all the un-googled,
D. Deryl Downey wrote in post #1097087:
I think he was talking to "Love U Ruby" not you...which means all of his
Ryan Victory wrote in post #1097122:
[#404491] so, what's the proper way to replace funcionality of GOTO ? — "Stu P. D'naim" <lists@...>
I need to make few scripts for tasks I do often manually, but last time
Stu P. D'naim wrote in post #1097111:
Love U Ruby: I'm really not sure what you meant by that response, but
Ryan Victory wrote in post #1097114:
I did consider jokingly showing the "enable jokes" compiler flag that
I think GOTO gets a bad rap. Actually, I find the COMEFROM command far more terrifying. It's mentioned in the comments...
i recall the Amiga thrived on tons of GOTO 's
callcc is one way to do a functional programming style goto statement
Yeah, I realized that...still doesn't make him right :-)
Actually this makes him pretty much the definition of right.
Be careful saying "no one uses BASIC nowdays". I have no doubt there is
There is no one way to replace GOTO. GOTO is at the heart of many structured control structures. What you need to do is think about what you are trying to do and where you are trying to go when you are done.
hash inside hash menus, interesting, same as Robert Klemme's example ...
[#404517] How do you associate the items of a collection instance with the collection in a smart Ruby way? — "Jesse F." <lists@...>
This is a conceptual question about Ruby. I think I may be thinking of
[#404528] Fun with finalizers — Garthy D <garthy_lmkltybr@...>
[#404533] Confusion with Ruby printing mechanics. — Love U Ruby <lists@...>
Here I just played to see how printing statement behaves with "nil"
[#404557] How the string concatenation operator hackes(modifies) the string contents of frozen array? — Love U Ruby <lists@...>
Hi,
humm, You are correct.
[#404560] makerakeworkwell 1.0.2 Released — Ryan Davis <ryand-ruby@...>
makerakeworkwell version 1.0.2 has been released!
[#404570] What is Ruby's default constructor? — Love U Ruby <lists@...>
Hi,
[#404628] Re: Adding camelize and underscore to String — tamouse mailing lists <tamouse.lists@...>
On Mon, Feb 18, 2013 at 12:07 AM, Rob Marshall <lists@ruby-forum.com> wrote:
On Mon, Feb 18, 2013 at 9:23 PM, tamouse mailing lists <
On Tue, Feb 19, 2013 at 4:45 AM, Josh Cheek <josh.cheek@gmail.com> wrote:
[#404632] Re: splat operator and Ruby instance variable assignments — Marc Heiler <lists@...>
Ok, understood what the guy wants ...
Marc Heiler wrote in post #1097736:
Ryan Davis wrote in post #1097840:
On 19 February 2013 20:35, Love U Ruby <lists@ruby-forum.com> wrote:
Peter Hickman wrote in post #1097848:
On 19 February 2013 21:22, Love U Ruby <lists@ruby-forum.com> wrote:
On Tue, 19 Feb 2013 22:37:59 +0100, Peter Hickman <peterhickman386@googlemail.com> wrote:
Always interesting when people bring out the proverbs
[#404668] variable editing in ruby (like zsh vared) — "R. Kumar" <lists@...>
I am redoing some zsh apps in ruby (commandline). One functionality was
[#404679] Python C API vs Ruby C API — Patrick <patrick@...>
Hi Everyone
[#404680] Fixnum: freeze status on ruby 2.0.0 rc2 — Enrico Rivarola <lists@...>
Hi,
[#404695] Instalation problem — "Carlos A." <lists@...>
HI!!
[#404696] THE CLASS/OBJECT CHICKEN-AND-EGG PARADOX — "Xavier R." <lists@...>
Hi,
Maybe you could provide more detail about what you are confused about. To
Matt Mongeau wrote in post #1098058:
It's not really a paradox. Take for example
Matt Mongeau wrote in post #1098076:
[#404697] Rdoc cannot find ruby files — Hakim Benbekhti <lists@...>
I am new to ruby and I am going through Peter Cooper’s book (Novice to
Thank you for the suggestion but no case sensitivity is not a problem.
[#404707] How meta class differs from real class ? — "Xavier R." <lists@...>
In Ruby-
[#404738] backslash substitution — Mario Ruiz <lists@...>
don't know why... but this is not working
Subject: backslash substitution
Yes I know.. but i cannot change the string... the string it is like it
Subject: Re: backslash substitution
you mean by using gsub... in the expample i posted i tried but didn't
[#404747] Using Mechanize gem to automate some tasks on Facebook — Bao Trung Tran Nguyen <trannguyenbaotrung@...>
Dear friends,
[#404749] Questionable regex performance when using lazy matching and inverted character classes — "Tikhon B." <lists@...>
Hi All,
On Thu, Feb 21, 2013 at 12:12 PM, Tikhon B. <lists@ruby-forum.com> wrote:
Robert Klemme wrote in post #1098199:
On Fri, Feb 22, 2013 at 1:21 AM, Tikhon B. <lists@ruby-forum.com> wrote:
[#404757] Difference between pretty_print_cycle and pretty_print. — Love U Ruby <lists@...>
From the link I found the two methods :
[#404770] Class method's has a fuzzy meaning and a sharp meaning — "Xavier R." <lists@...>
David A. Black in his book - "The Well-Grounded Rubyist"
[#404809] Difference of 2 dates interms of years. — "Xavier R." <lists@...>
how can we get the experience years between two dates(ex:2012-01-11 to
Post some things you've tried.
How might you modify that to handle years?
Matt Mongeau wrote in post #1098486:
[#404817] Not able to understand the difference between "||=" and "|=". — "Xavier R." <lists@...>
>> a = []
On the same road I tried to the "&&=" as below :
On 02/22/2013 01:08 PM, Xavier R. wrote:
Justin Collins wrote in post #1098508:
[#404839] range is not assigning to the splat variable. — Love U Ruby <lists@...>
Why splat variable couldn't take in the below two code the "range" ->
Splat is an array, Rang is not an array.
On Sat, 23 Feb 2013 07:08:05 +0100, Matthew Kerwin <lists@ruby-forum.com> wrote:
On 23 February 2013 18:52, Bartosz Dziewoナгki <matma.rex@gmail.com> wrote:
On Sat, 23 Feb 2013 13:44:25 +0100, Matthew Kerwin <matthew@kerwin.net.au> wrote:
[#404842] Why class returning its own name when "include" statement? — Love U Ruby <lists@...>
I was actually playing around with the class definition return values.
@Stefano Yes you are right. The below code is proved that.
On Feb 23, 2013 2:21 AM, "Love U Ruby" <lists@ruby-forum.com> wrote:
tamouse mailing lists wrote in post #1098808:
Am 23.02.2013 09:20, schrieb Love U Ruby:
[#404853] Regarding the instantiation relations in Ruby? — Love U Ruby <lists@...>
Is the below statement holds true in the course of instantiation
[#404867] how to see the class creation time in Ruby? — Love U Ruby <lists@...>
In Ruby any chance to see the last-modified time of a specific class?
Ohh! here I tried but none of them worked.
Xavier R. wrote in post #1098609:
[#404886] why "Range" not worked on "to_ary" ? — "Xavier R." <lists@...>
>> (1..9).to_a
[#404901] Confusion with `nil` value being produced by IRB in case of Array#size manipulation. — Love U Ruby <lists@...>
enum[int] = obj → obj
its because ruby does not make a difference in Array#[] if the element
Hans Mackowiak wrote in post #1098729:
Am 24.02.2013 13:26, schrieb Love U Ruby:
Have you even tried to read the documentation???
unknown wrote in post #1098721:
[#404914] How to create a new database in ruby with sqlite3? — Hakim Benbekhti <lists@...>
Here is what I wrote on my Terminal. I tried different ways of writing
[#404921] How should I print only the last combination when using Array#combination(n) ? — Love U Ruby <lists@...>
>> a = [1,2,3]
see the below code :
a.combination(2).reverse_each.first #=> [2, 3]
On Sun, Feb 24, 2013 at 8:55 AM, Love U Ruby <lists@ruby-forum.com> wrote:
tamouse mailing lists wrote in post #1098785:
On Sun, Feb 24, 2013 at 9:15 AM, Love U Ruby <lists@ruby-forum.com> wrote:
[#404943] How to upgrade ruby to the latest version in ubuntu ? — Love U Ruby <lists@...>
@ubuntu:~$ ruby -v
you can use brightbox's ppa
Kiswono Prayogo wrote in post #1098865:
[#404956] RubyInstaller 2.0.0-p0 released — Luis Lavena <luislavena@...>
In combination with the rest of the RubyInstaller team, I'm very
On Sun, Feb 24, 2013 at 7:05 PM, Tim0 <tigre7t@gmail.com> wrote:
[#404969] Possible mruby bug in mrb_load_string — Garthy D <garthy_lmkltybr@...>
[#404981] Ruby String directives — "Kumar R." <lists@...>
Hi guys,
[#405000] no element found error with selenium-webdriver — Love U Ruby <lists@...>
For the below code I am getting error as "no element found"
[#405003] Help..Newbe to Ruby — "shaji n." <lists@...>
Greetings
Microsoft Windows XP [Version 5.1.2600]
[#405020] undefined local variable or method `m' — Love U Ruby <lists@...>
>> class Test
[#405025] Confusion with self within methods. — Love U Ruby <lists@...>
To see who is playing the role of `self` in `nested methods`, I tried
Doing more play with it I found the below code:
How about reading a Ruby book or two, or working through
[#405026] Please, help (GCD) greatest common divisor. — Caddy Tonks Lupin <lists@...>
Write a program to read two integers and show their greatest common
Best I could do on short notice:
On Tue, Feb 26, 2013 at 12:48 PM, Bartosz Dziewoナгki
Hello Everyone,
Caddy:
Wayne Brisette wrote in post #1099174:
Don't you think you'd learn better if you actually tried to figure it
[#405032] Does 'gem list' go by .gemspec only? — Ron Lipke <lists@...>
Hello, Ruby beginner here trying to learn as much as I can.
[#405033] Get it on one line? — Patric Åberg <lists@...>
Hello pros!
[#405053] Programming Ruby 2.0 ? — "Jabari Z." <lists@...>
Has anyone heard about a Programming Ruby 2.0 edition coming out?
Yes, there's work going on. Dave Thomas asked some days ago on the
[#405059] Does this specific sound library exist? — Dirk Vogel <lists@...>
Hi there,
[#405067] Mac OS 10.8.2 and openssl — "Dr. Hegewald" <hegewald@...>
Hi everybody,
Subject: Mac OS 10.8.2 and openssl
Hi Carlo and all,
Subject: Re: Mac OS 10.8.2 and openssl
Hi Carlo and all,
Subject: Re: Mac OS 10.8.2 and openssl
On Wed, Feb 27, 2013 at 3:32 AM, Dr. Hegewald <hegewald@irmb.tu-bs.de> wrote:
[#405079] Why `10` not returned without the `return` from the block ? — Love U Ruby <lists@...>
CODE - I
But why mean to say when the below code works:
I seriously believe now that you are trolling this list. I, for one, am
[#405107] Object track llist for a particular class. — "Xavier R." <lists@...>
Say I have created more than one instances from a particular class as
Hash[local_variables.map {|k| [k,eval(k.to_s)]}]
Hans Mackowiak wrote in post #1099426:
[#405134] Match array1 with array2 — "Mattias A." <lists@...>
Hi,
[#405145] Discussion on Ruby's `alias` — Tukai Patra <lists@...>
>> class Foo
On 28.02.2013 12:34, Tukai Patra wrote:
[#405175] telnet - how to loop through commands listed in a file — Bob Ford <lists@...>
Let me first explain what I'm trying to do. I have written a very
Hmmm, The files are entered from the command line using a getopt (e.g -f
Am 05.03.2013 19:07, schrieb Bob Ford:
I've now run into a little conundrum. There is one command that can
Re: Implementing DRY with a function call
On 7 February 2013 10:39, Rob Marshall <lists@ruby-forum.com> wrote:
> Every other language I've worked in, C, Perl, Python, Java...the way you
> call a function with arguments is: func(arg1, arg2, arg3). In Python you
> can have variable args and keyword args specified as (*args, **kwargs),
> but in general you define the arguments that a function expects, and
> then pass those arguments between parentheses.
Give or take a few other var-args tricks. Remember C has stdarg.h and
allows function signatures like:
void func(...);
And Java has special array syntactic sugar:
public static void func(Object... args)
And PHP almost completely ignores the variables named in the function
signature, because you can always use func_num_args() and func_get_args()
etc.
Ruby allows non-parenthetical args, the same as shell script (e.g. Bash).
Technically perl doesn't require parentheses either, except that functions
in perl expect a list of parameters, and perl lists use parentheses, etc.
etc. Upshot: `$thingy->foo` is also a function call in perl.
> So the idea that I could
> do:
>
> func(arg1,arg2,arg3) { block }
>
> And a) Not get a syntax error, and b) Be able to define the parameters
> for the function as:
>
> def func(*args)
> yield
> end
>
> and not only get the args specified between the parens in *args, but
> also still pass the block and "yield" it, is a very new, and foreign,
> concept for me.
>
If it helps, you can also define it as:
def func(*args, &a_block)
if you want to make explicit the fact that there is (or expects to be) a
block. It also gives you direct access to the block, so you can poke it
and stuff.
> What I find a bit confusing about Ruby is that, given:
>
> def func(*args)
> args.each { |a| puts a }
> yield
> end
>
> Then do the following:
>
> >> func "this", "is", "a", "test", return_value("something")
> this
> is
> a
> test
> This is the returning value: something
> LocalJumpError: no block given
> from (irb):108:in `func'
> from (irb):110
>
> This one is sort-of obvious since the function return_value (which is
> just a dummy function that simply shows calling a function with some
> arbitrary value and returning it slightly modified...so don't get hung
> up on it) is evaluated prior to being passed as an argument to func. But
> since there's no block, I get the LocalJumpError.
>
To the first remark: this is the same as any other programming language.
For example in Java:
func("this", "is", "a", "test", return_value("something"));
...will execute the 'return_value' function first, then pass its result as
the final parameter to 'func'.
As an aside to the second: You can get around/preempt the LocalJumpError by
wrapping `yield` thus:
def func(*args)
args.each { |a| puts a }
yield if block_given?
end
Not necessarily what you want to do here, but handy to know.
>> func "this", "is", "a", "test", { return_value("something") }
> SyntaxError: compile error
> (irb):111: odd number list for Hash
> from (irb):111
>
> This is is also somewhat obvious because it isn't treating the {} as
> defining a block but attempting to define a hash...That's because I
> haven't "formally" defined the arguments, so the interpreter assumes
> everything is supposed to be an argument and not a block.
>
That would happen irrespective of how you define the function parameters.
SyntaxErrors happen when ruby is parsing and interpreting the file, not
when it's executing. A curly brace that follows a comma is _always_
interpreted as the start of a Hash literal.
Since blocks are special, "out-of-band" parameters, you don't need a comma
to distinguish them from the other args. However, since curly-brace block
syntax looks a lot like Hash literal syntax, you need to give the parser a
bit more help in this case (i.e. by explicitly wrapping the "real" args in
parens, then giving the block.)
> >> func("this", "is", "a", "test") { return_value("something") }
> this
> is
> a
> test
> => "This is the returning value: something"
>
> This is still the odd one for me that now (sort-of) makes sense but
> would NOT be allowed in any language I've used in the past. So it's
> going to take some getting used to...
This is true, but only because those other languages don't have blocks.
Note that the following calls are equivalent:
func("this", "is", "a", "test") { return_value("something") }
func "this", "is", "a", "test" do
return_value "something"
end
my_block = proc { return_value("something") }
func "this", "is", "a", "test", &my_block
my_block = proc { return_value("something") }
func("this", "is", "a", "test", &my_block)
The third and fourth versions are the call-site equivalent of the `def
func(*args, &a_block)` definition I mentioned above.
I hope this helps shed a little light on the issue, and gives you some
pointers for further research.
--
Matthew Kerwin, B.Sc (CompSci) (Hons)
http://matthew.kerwin.net.au/
ABN: 59-013-727-651
"You'll never find a programming language that frees
you from the burden of clarifying your ideas." - xkcd