what is the ruby way to do this?

[ako...]

@attributes = {}

# Assumes the given object quacks on 'key'
def @attributes.<<( keyed_obj )
(self[keyed_obj.key]||=[])<<keyed_obj
end

@attributes << a1
@attributes << a2
@attributes << a3

this is something i have never seen. would you explain the 'def' line
above? is this the same as class << @attributes; def << ...; end ?

 

[Jeff Wood]

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It's defining the << operator on the @attributes object

j.

@attributes =3D {}

# Assumes the given object quacks on 'key'
def @attributes.<<( keyed_obj )
(self[keyed_obj.key]||=3D[])<<keyed_obj
end

@attributes << a1
@attributes << a2
@attributes << a3

this is something i have never seen. would you explain the 'def' line
above? is this the same as class << @attributes; def << ...; end ?

--
"Remember. Understand. Believe. Yield! -> http://ruby-lang.org"

Jeff Wood

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[Jeff Wood]

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I would do

a =3D Hash.new { || [] }

def a.addValue( valueHash )
valueHash.each_pair { |key,value| self[ key ] <<=3D value }
end

a.addValue "blah" =3D> "a"
a.addValue "blah" =3D> "b"
a.addValue "blah" =3D> "c"

I kinda like the look of the arrows

j.

--
"Remember. Understand. Believe. Yield! -> http://ruby-lang.org"

Jeff Wood

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[Joe Van Dyk]

hello,

i am still learning.

Hopefully there isn't anyone who isn't!

 

[David A. Black]

Hi --

I would do

a = Hash.new { || [] }

I believe that's the first empty || I've ever seen. It's awfully
confusing (my first reaction was: *what* or an empty array? I'd
strongly encourage you to eschew that construct. It's deservedly
unheard of


David

 

[Ara.T.Howard]

Hi --

I would do

a = Hash.new { || [] }

I believe that's the first empty || I've ever seen. It's awfully
confusing (my first reaction was: *what* or an empty array? I'd
strongly encourage you to eschew that construct. It's deservedly
unheard of

i must confess i love it! probably won't use it much. but i love it.

-a
--
===============================================================================
| ara [dot] t [dot] howard [at] gmail [dot] com
| all happiness comes from the desire for others to be happy. all misery
| comes from the desire for oneself to be happy.
| -- bodhicaryavatara
===============================================================================

 

[Jeff Wood]

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ok ...

a =3D Hash.new ->{ [] }

# new syntax

...

Hi --

I would do

a =3D Hash.new { || [] }

I believe that's the first empty || I've ever seen. It's awfully
confusing (my first reaction was: *what* or an empty array? I'd
strongly encourage you to eschew that construct. It's deservedly
unheard of

i must confess i love it! probably won't use it much. but i love it.

-a
--

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D
| ara [dot] t [dot] howard [at] gmail [dot] com
| all happiness comes from the desire for others to be happy. all misery
| comes from the desire for oneself to be happy.
| -- bodhicaryavatara

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D

--
"Remember. Understand. Believe. Yield! -> http://ruby-lang.org"

Jeff Wood

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[James Britt]

Hi --

I would do

a = Hash.new { || [] }

I believe that's the first empty || I've ever seen. It's awfully
confusing (my first reaction was: *what* or an empty array? I'd
strongly encourage you to eschew that construct. It's deservedly
unheard of

i must confess i love it! probably won't use it much. but i love it.

I love it too, and will use it simply because David said he'd never seen
it before.



James

--

http://www.ruby-doc.org - Ruby Help & Documentation
http://www.artima.com/rubycs/ - Ruby Code & Style: Writers wanted
http://www.rubystuff.com - The Ruby Store for Ruby Stuff
http://www.jamesbritt.com - Playing with Better Toys
http://www.30secondrule.com - Building Better Tools

 

[David A. Black]

Hi --

Hi --

I would do

a = Hash.new { || [] }

I believe that's the first empty || I've ever seen. It's awfully
confusing (my first reaction was: *what* or an empty array? I'd
strongly encourage you to eschew that construct. It's deservedly
unheard of

i must confess i love it! probably won't use it much. but i love it.

Keep it firmly in mind if there's every another obfuscated Ruby
contest....


David

 

[David A. Black]

Hi --

Hi --

On Wed, 23 Nov 2005, Jeff Wood wrote:

I would do

a = Hash.new { || [] }


I believe that's the first empty || I've ever seen. It's awfully
confusing (my first reaction was: *what* or an empty array? I'd
strongly encourage you to eschew that construct. It's deservedly
unheard of

i must confess i love it! probably won't use it much. but i love it.

I love it too, and will use it simply because David said he'd never seen it
before.

But now I've seen it, so you don't have to


David

 

[Ryan Leavengood]

Hi --

I would do

a =3D Hash.new { || [] }

I believe that's the first empty || I've ever seen. It's awfully
confusing (my first reaction was: *what* or an empty array? I'd
strongly encourage you to eschew that construct. It's deservedly
unheard of

i must confess i love it! probably won't use it much. but i love it.

Yeah that is nuts...but I really like it

Ryan

 

[David A. Black]

Hi --

Hi --

On Wed, 23 Nov 2005, Jeff Wood wrote:

I would do

a = Hash.new { || [] }

I believe that's the first empty || I've ever seen. It's awfully
confusing (my first reaction was: *what* or an empty array? I'd
strongly encourage you to eschew that construct. It's deservedly
unheard of

i must confess i love it! probably won't use it much. but i love it.

Yeah that is nuts...but I really like it

Et tu, Leavengood?


David

 

[Ryan Leavengood]

Et tu, Leavengood?

ROFL. Yes indeed. I have yet to really reveal it, but I have quite a
penchant for obfuscated Ruby code, and plan to compete in the next
IORCC. I also enjoy Ruby Golf, as can be seen in my recent Ruby Quiz
submission.

I just like the irony that it takes a really good Ruby programmer to
write such bad, evil code

Ryan

 

[Rob Rypka]

I would do

a =3D Hash.new { || [] }

I believe that's the first empty || I've ever seen. It's awfully
confusing (my first reaction was: *what* or an empty array? I'd
strongly encourage you to eschew that construct. It's deservedly
unheard of

Perhaps I'm missing something. Is there something wrong with the following=
?

a =3D Hash.new { [] }

irb tells me that it gets a new array each time.

 

[Lyndon Samson]

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It would be nice if there was a wiki page somewhere of these Uberdioms...

I would do

a =3D Hash.new { || [] }

I believe that's the first empty || I've ever seen. It's awfully
confusing (my first reaction was: *what* or an empty array? I'd
strongly encourage you to eschew that construct. It's deservedly
unheard of

Perhaps I'm missing something. Is there something wrong with the
following?

a =3D Hash.new { [] }

irb tells me that it gets a new array each time.

 

[David A. Black]

Hi --

It would be nice if there was a wiki page somewhere of these Uberdioms...

I'm not sure what you mean. A wiki page of... ?


David

 

[Ryan Leavengood]

Perhaps I'm missing something. Is there something wrong with the followi= ng?

a =3D Hash.new { [] }

irb tells me that it gets a new array each time.

No that is how it works and that is basically what Jeff's code does.
He just has empty "goal-posts" in the block as well (it isn't really
an or operation.) He gets around the new array every time thing by
using self[key] <<=3D value, which is self[key] =3D self[key] << value.
The block will only be called when there is no values for the given
key, and once the above code is called, there will be a value for the
given key (the array.) It is pretty slick (I didn't even know <<=3D
existed.)

Ryan

 

[James Britt]

It would be nice if there was a wiki page somewhere of these Uberdioms...

Such as http://www.rubygarden.org/ruby?RubyIdioms ?

James

 

[Lyndon Samson]

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Hi --


Uberdioms...

I'm not sure what you mean. A wiki page of... ?

Sorry

Uberdioms =3D Uber Idioms =3D Made up word representing powerfull and somet=
imes
lacking in immediate clarity language constructs that programmers should
be aware of but not necessarily utilising in all circumstances.





David

 

[Joel VanderWerf]

Hi --

I would do

a = Hash.new { || [] }

I believe that's the first empty || I've ever seen. It's awfully
confusing (my first reaction was: *what* or an empty array? I'd
strongly encourage you to eschew that construct. It's deservedly
unheard of

It's not completely useless:

irb(main):001:0> noargs = proc { || 3 }
=> #<Proc:0xb7b3558c@(irb):1>
irb(main):002:0> noargs[]
=> 3
irb(main):003:0> noargs[2]
ArgumentError: wrong number of arguments (1 for 0)
from (irb):3
from (irb):3