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Re: code blocks and methods

DDENNISON

4/9/2007 1:28:00 PM

I like to think of code blocks as a visitor pattern or a callback function.
You are essentially passing in a chunk of code to a method to be executed
for each logical element of data.



James Edward Gray
II
<james@grayproduc To
tions.net> ruby-talk@ruby-lang.org (ruby-talk
ML)
04/09/2007 07:46 cc
AM
Subject
Re: code blocks and methods
Please respond to
ruby-talk@ruby-la
ng.org







On Apr 8, 2007, at 12:29 PM, botp wrote:

> On 4/9/07, andy <eps@mailinator.com> wrote:
>> I am familiar with c# and java, one thing I don't understand is the
>> difference between code blocks and methods, can anyone offer a better
>> explanation than the one on the site above ?
>
> to quote carlson et al, "a Ruby code block is a method that has no
> name." see http://www.devarticles.com/c/a/Ruby-on-Rails/Co...
> and-Iteration/
> or the ruby cookbook.

I wrote about my take on code blocks for my blog a while back:

http://blog.grayproductions.net/articles/2006/01/05/code-as-a...

James Edward Gray II



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2 Answers

Rick DeNatale

4/9/2007 1:58:00 PM

0

On 4/9/07, DDENNISON@up.com <DDENNISON@up.com> wrote:
> I like to think of code blocks as a visitor pattern or a callback function.
> You are essentially passing in a chunk of code to a method to be executed
> for each logical element of data.

That's more a description of how they are used in iterator methods
rather than a general description of code blocks and the variety of
ways they can be used.

--
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denh...

John Joyce

4/9/2007 3:00:00 PM

0

Ruby blocks are generally far simpler than they seem at first.
On Apr 9, 2007, at 10:57 PM, Rick DeNatale wrote:

> On 4/9/07, DDENNISON@up.com <DDENNISON@up.com> wrote:
>> I like to think of code blocks as a visitor pattern or a callback
>> function.
>> You are essentially passing in a chunk of code to a method to be
>> executed
>> for each logical element of data.
>
> That's more a description of how they are used in iterator methods
> rather than a general description of code blocks and the variety of
> ways they can be used.
>
> --
> Rick DeNatale
>
> My blog on Ruby
> http://talklikeaduck.denh...
>