[#407882] Ruby extremely slow compared to PHP — Mick Jagger <lists@...>

Hello there, how are you? Hope you are fine. I am a PHP programmer

17 messages 2013/06/02

[#407908] TCPServer/Socket and Marshal problem — Panagiotis Atmatzidis <atma@...>

Hello,

18 messages 2013/06/03

[#407946] Is rubyquiz.com dead? — Alphonse 23 <lists@...>

Thread title says everything.

18 messages 2013/06/04

[#408012] Need help understanding recursion. — pedro oliva <lists@...>

Ive been reading Chris Pine's book 'Learn to Program' and its been going

11 messages 2013/06/06

[#408129] Getting Started With Development — Chamila Wijayarathna <cdwijayarathna@...>

I'm new to Ruby Development. I downloaded source from Github, but couldn't

24 messages 2013/06/11
[#408131] Re: Getting Started With Development — Per-erik Martin <lists@...> 2013/06/11

Ruby is often installed on linux, or can be easily installed with the

[#408146] Re: Getting Started With Development — "Chamila W." <lists@...> 2013/06/11

Per-erik Martin wrote in post #1112021:

[#408149] Re: Getting Started With Development — "Carlo E. Prelz" <fluido@...> 2013/06/11

Subject: Re: Getting Started With Development

[#408198] NokoGiri XML Parser — "Devender P." <lists@...>

Hi,

11 messages 2013/06/13

[#408201] trying to load a .rb file in irb — "Eric D." <lists@...>

I am trying to load a ruby program into irb and it will not load.

12 messages 2013/06/13

[#408205] Can I use Sinatra to render dynamic pages? — Ruby Student <ruby.student@...>

Hell Team,

18 messages 2013/06/13
[#408219] Re: Can I use Sinatra to render dynamic pages? — Nicholas Van Weerdenburg <vanweerd@...> 2013/06/14

You should be able to do this without JavaScript by using streaming.

[#408228] Re: Can I use Sinatra to render dynamic pages? — Ruby Student <ruby.student@...> 2013/06/14

Well, I got some good suggestions from everyone here. I thank you all for

[#408275] Compare and sort one array according to another. — masta Blasta <lists@...>

I have two arrays of objects that look something like this:

14 messages 2013/06/17

[#408276] Comparing objects — "Thom T." <lists@...>

How do I compare two objects in Ruby, considering only attributes

15 messages 2013/06/17

[#408307] getting the most out of Ruby — robin wood <lists@...>

I write a lot of scripts in Ruby, most are small simple things but some

13 messages 2013/06/18

[#408309] Creating ruby script exe — Rochit Sen <lists@...>

Hi All,

17 messages 2013/06/18

[#408357] Beginners problem with database and datamapper — cristian cristian <lists@...>

Hi all!

28 messages 2013/06/20

[#408437] How do I input a variable floating point number into Ruby Programs — "Michael P F." <lists@...>

I want to evaluate the following interactively:

10 messages 2013/06/23

[#408518] #!/usr/bin/env: No such file or directory — Todd Sterben <lists@...>

I am new to both linux and ruby. I am using Ubuntu and Ruby 1.9

17 messages 2013/06/27

[#408528] Designing a Cabinet class — Mike Vezzani <lists@...>

Hello all,

12 messages 2013/06/27

[#408561] Find elment in array of hashes — Rodrigo Lueneberg <lists@...>

array = {:id=>1, :price =>0.25} # index[0]

23 messages 2013/06/28

Re: Where's this ruby feature documented? ...and the case of an accidentally discovered feature.

From: Justin Collins <justincollins@...>
Date: 2013-06-28 05:56:49 UTC
List: ruby-talk #408555
On 06/27/2013 04:24 PM, Kendall Gifford wrote:
> So, while doing some random testing in an IRB session, I accidentally
> discovered a feature of ruby that is new to me. Apparently, you can call
> a method named "call" by omitting the name of the method you wish to call:
>
> 1.9.3-p194 :001 > x = -> { puts "Hello, world." }
>   => #<Proc:0x007f820d179710@(irb):1 (lambda)>
> 1.9.3-p194 :002 > x.()
> Hello, world.
>   => nil
>
> Or, more explicitly:
>
> 1.9.3-p194 :001 > class X
> 1.9.3-p194 :002?>   def call(name)
> 1.9.3-p194 :003?>     puts "Hello, #{name}"
> 1.9.3-p194 :004?>     end
> 1.9.3-p194 :005?>   end
>   => nil
> 1.9.3-p194 :006 > x = X.new
>   => #<X:0x007f968b92e6d0>
> 1.9.3-p194 :007 > x.("Bob")
> Hello, Bob
>   => nil
>
> In all the books, articles, blogs, and tutorials that I've read, I don't
> recall any every mentioning this feature anywhere. As soon as I stumbled
> on this feature, I search the Pickaxe book and Google to see if and
> where this feature was documented. No luck.
>
> What I did end up finding was a chunk of example code from the jbuilder
> gem's README that uses this feature:
> https://github.com/rails/jbuilder/blob/master/README.md
>
> Specifically, the 3rd line in the first code example:
>
> json.(@message, :created_at, :updated_at)
>
> I'm sure there's code and examples out there that also use this feature.
> However, what I'd really be interested in knowing is just what this
> feature is officially called and where it's documented (I'm just really
> OCD and curious about some things).
>
> Anyone know of the top your head? How long has this feature been in
> ruby? All along? Is it a newer feature?

It was added in Ruby 1.9. It is mentioned somewhat in passing in the 
docs for Proc#call: 
http://www.ruby-doc.org/core-1.9.3/Proc.html#method-i-call

 From what I can tell, this syntax just isn't that popular. I have 
definitely never seen it used as a proxy for #call on an object other 
than a Proc, although I admit it's kind of cool.

-Justin


In This Thread