Blocks, eval and named parameters

ruby-talk
1

From: Dan Doel [mailto:djd15@po.cwru.edu]
Sent: Wednesday, August 27, 2003 1:46 AM
To: ruby-talk@ruby-lang.org
Subject: Blocks, eval and named parameters

Anyhow, any thoughts on all this? Thanks in advance for the
stuff I’ll
probably learn from any discussion
that ensues.

  • Dan

It’s been discussed on RubyGarden to some degree. See

Regards,

Dan

···

-----Original Message-----

2

Berger, Daniel wrote:

It’s been discussed on RubyGarden to some degree. See

http://www.rubygarden.org/ruby?KeywordArguments

Thanks for the link, but it doesn’t seem to answer my question at all
(which was about
passing a block to #eval and such). :slight_smile:

I guess I should ramble a bit less in my posts.

  • Dan
3

Hal introduced the following technique in his presentation at the
Euruko
(http://hypermetrics.com/rubyhacker/euruko03/rubyesque/slide7.html)

class A
attr_writer :foo
def initialize
yield self
class << self; private :foo; end
end
end

to avoid leaving accessors after instantiation.

You could generalize this as follows:

def foo
s = Struct.new(:param1, :param2, :etc)
yield s
# do things with s.param1, s.param2, s.etc
end

foo do |p|
p.param1 = :bla
p.param2 = “foo”
p.etc = [‘bar’, ‘baz’]
end

···

On Thu, Aug 28, 2003 at 05:13:37PM +0900, Dan Doel wrote:

Berger, Daniel wrote:

It’s been discussed on RubyGarden to some degree. See

http://www.rubygarden.org/ruby?KeywordArguments

Thanks for the link, but it doesn’t seem to answer my question at all
(which was about
passing a block to #eval and such). :slight_smile:

–
_ _

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'_ \ / | __/ __| '_ _ \ / ` | ’ \
) | (| | |__ \ | | | | | (| | | | |
.__/ _,|_|/| || ||_,|| |_|
Running Debian GNU/Linux Sid (unstable)
batsman dot geo at yahoo dot com

Sorry. I just realized this sentance makes no sense :slight_smile:
– Ian Main

4

What a thoroughly useful set of slides for a newbie. And, as a bonus, an
introduction to his writing style…now I know I want the book :slight_smile:

  • dan

“Mauricio Fernández” batsman.geo@yahoo.com wrote in message
news:20030828093315.GB12453@student.ei.uni-stuttgart.de…

···

Hal introduced the following technique in his presentation at the
Euruko
(http://hypermetrics.com/rubyhacker/euruko03/rubyesque/slide7.html)

5

dhtapp wrote:

What a thoroughly useful set of slides for a newbie. And, as a bonus, an
introduction to his writing style…now I know I want the book :slight_smile:

Thanks. That kind of comliment makes it worthwhile.

Hal

···
  • dan

“Mauricio Fernández” batsman.geo@yahoo.com wrote in message
news:20030828093315.GB12453@student.ei.uni-stuttgart.de…

Hal introduced the following technique in his presentation at the
Euruko
(http://hypermetrics.com/rubyhacker/euruko03/rubyesque/slide7.html)