Rails spinoffs - Feb 2007 - $H.each() behavior in Prototype 1.5 final

Hi !

A little question about each() function:

function test() {
  $H(hashtable).each(function(entry,idx){   /* code */  });
}

In my /*code*/ I can do
- throw $continue
- throw $break

But can I do a return xxx ? It seems the loop didn''t ends ?
Is it normal ?


Regards,
-- 
Jean-Philippe Encausse - R&D Jalios SA
Jp [at] encausse.net - http://www.encausse.com - http://www.jalias.com
GTalk: jp.encausse [at] gmail.com - SMS: sms [at] jp.encausse.net
Mob: +33 6 82 12 56 99 Jalios: +33 1 39 23 92 83 Tel: +33 1 39 18 90 15
Do it Once, Use it Twice ~ Do it Twice, Make It Once

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Spinoffs" group.
To post to this group, send email to
rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-spinoffs?hl=en
-~----------~----~----~----~------~----~------~--~---

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Jean-Philippe Encausse wrote:
> A little question about each() function:
> function test() {
>   $H(hashtable).each(function(entry,idx){   /* code */  });
> }
> 
> In my /*code*/ I can do
> - throw $continue
> - throw $break
> 
> But can I do a return xxx ?
Yes, it will have the same effect as (the already obsolete)
"throw $continue".
> It seems the loop didn''t ends ? Is it normal ?
OFC it''s normal. Remember that "your code is outside of the loop
scope: the
looping code happens behind the scene". Yes, I was quoting the docs:
 http://prototypejs.org/api/enumerable/each

Jean-Philippe, should I suppose you were trying to use "each ->
return"
hoping for a "filter"? That''s plain wrong, you should use
"grep", "find" or
"findAll" for such things. For example, to filter out
"false" values you
could use:
  $H({ a:0, b:1, c:0, d:3 }).findAll(function(x){ return x.value })
  // returns: [["b", 1], ["d", 3]]


BTW, folks, we need a documentation update, telling people there is no
"throw $continue" in Enumerables from starters, in order to avoid any
confusion when they will update to a newer version which won''t support
that
for good (yes, Sam already dropped it in SVN).

- --
Marius Feraru
-----BEGIN PGP SIGNATURE-----

iD8DBQFFwdPPtZHp/AYZiNkRAhziAKCiCXt7ThBdL6TM8kduCmVh6l2fdwCgyfuT
mYMLYeq2KWfaXbMh6pNjQ0Y=0ILK
-----END PGP SIGNATURE-----

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Spinoffs" group.
To post to this group, send email to
rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-spinoffs?hl=en
-~----------~----~----~----~------~----~------~--~---

1. So there is no longer $continue and I have to use return
2. I understand the behavior of return because it is a function given to each()
but It''s not the same behavior like in other programming language:

In Java:

public Object method(){
  for (Iterator it = collect.iterator; it.hasNext(); ){
    Object obj = it.next();

    if (...){  continue;  }
    if (...){  continue;  }
    if (...){  continue;  }

    return obj;
  }
}


In prototype I have to do:

function(){
  var good;
  $H(collect).each(function(entry,idx){

    if (...){ return; /* throw $continue; */}
    if (...){ return; }
    if (...){ return; }

    good = entry.value;
    throw $break;
  }
  return good;
}

That''s more complicated. I hoped to return directly entry.value;

Regards


On 2/1/07, Marius Feraru <altblue-9gptZ63fvgw@public.gmane.org>
wrote:
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Jean-Philippe Encausse wrote:
> > A little question about each() function:
> > function test() {
> >   $H(hashtable).each(function(entry,idx){   /* code */  });
> > }
> >
> > In my /*code*/ I can do
> > - throw $continue
> > - throw $break
> >
> > But can I do a return xxx ?
> Yes, it will have the same effect as (the already obsolete)
> "throw $continue".
>
> > It seems the loop didn''t ends ? Is it normal ?
> OFC it''s normal. Remember that "your code is outside of the
loop scope: the
> looping code happens behind the scene". Yes, I was quoting the docs:
>  http://prototypejs.org/api/enumerable/each
>
> Jean-Philippe, should I suppose you were trying to use "each ->
return"
> hoping for a "filter"? That''s plain wrong, you should
use "grep", "find" or
> "findAll" for such things. For example, to filter out
"false" values you
> could use:
>   $H({ a:0, b:1, c:0, d:3 }).findAll(function(x){ return x.value })
>   // returns: [["b", 1], ["d", 3]]
>
>
> BTW, folks, we need a documentation update, telling people there is no
> "throw $continue" in Enumerables from starters, in order to avoid
any
> confusion when they will update to a newer version which won''t
support that
> for good (yes, Sam already dropped it in SVN).
>
> - --
> Marius Feraru
> -----BEGIN PGP SIGNATURE-----
>
> iD8DBQFFwdPPtZHp/AYZiNkRAhziAKCiCXt7ThBdL6TM8kduCmVh6l2fdwCgyfuT
> mYMLYeq2KWfaXbMh6pNjQ0Y> =0ILK
> -----END PGP SIGNATURE-----
>
> >
>

-- 
Jean-Philippe Encausse - R&D Jalios SA
Jp [at] encausse.net - http://www.encausse.com - http://www.jalias.com
GTalk: jp.encausse [at] gmail.com - SMS: sms [at] jp.encausse.net
Mob: +33 6 82 12 56 99 Jalios: +33 1 39 23 92 83 Tel: +33 1 39 18 90 15
Do it Once, Use it Twice ~ Do it Twice, Make It Once

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Spinoffs" group.
To post to this group, send email to
rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-spinoffs?hl=en
-~----------~----~----~----~------~----~------~--~---

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Jean-Philippe Encausse wrote:
> 1. So there is no longer $continue and I have to use return
Yes, 1.5.0 is the last release to support this construct _in Enumerable_.
> 2. I understand the behavior of return because it is a function given to 
> each() but It''s not the same behavior like in other programming
language
OFC it isn''t. I have to say it again, you''re using Enumerable
there, which
is by not a "normal loop" (which - obviously - would work as you
expect).
Please read Enumerable docs, it really rocks once you''re getting
comfortable
with it: http://prototypejs.org/api/enumerable
> That''s more complicated. I hoped to return directly entry.value;
Sorry, that''s the way Enumerable works. :)

cheers
- --
Marius Feraru
-----BEGIN PGP SIGNATURE-----

iD8DBQFFwkWBtZHp/AYZiNkRApnTAJ48nKgnHG686ul9qOrs0Hn89fu4nACfXB3J
ewp7QoPCNf8ADEPP7U/8s0M=+c22
-----END PGP SIGNATURE-----

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Spinoffs" group.
To post to this group, send email to
rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-spinoffs?hl=en
-~----------~----~----~----~------~----~------~--~---

> > 2. I understand the behavior of return because it is a function given
to
> > each() but It''s not the same behavior like in other
programming language
> OFC it isn''t. I have to say it again, you''re using
Enumerable there, which
> is by not a "normal loop" (which - obviously - would work as you
expect).
> Please read Enumerable docs, it really rocks once you''re getting
comfortable
> with it: http://prototypejs.org/api/enumerable

- I don''t remember,  Was it In the same behavior in prototype 1.4?
- So now I should use find() and my function should return true or false ?


Thanks,
Regards

-- 
Jean-Philippe Encausse - R&D Jalios SA
Jp [at] encausse.net - http://www.encausse.com - http://www.jalias.com
GTalk: jp.encausse [at] gmail.com - SMS: sms [at] jp.encausse.net
Mob: +33 6 82 12 56 99 Jalios: +33 1 39 23 92 83 Tel: +33 1 39 18 90 15
Do it Once, Use it Twice ~ Do it Twice, Make It Once

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Spinoffs" group.
To post to this group, send email to
rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-spinoffs?hl=en
-~----------~----~----~----~------~----~------~--~---

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Jean-Philippe Encausse wrote:
>>> 2. I understand the behavior of return because it is a function
given to
>>> each() but It''s not the same behavior like in other
programming language
>> OFC it isn''t. I have to say it again, you''re using
Enumerable there, which
>> is by not a "normal loop" (which - obviously - would work as
you expect).
> - I don''t remember,  Was it In the same behavior in prototype 1.4?
Yes.
> - So now I should use find() and my function should return true or false ?
You really sound like desperately needing an Enumerable tutorial :))
As your name sounds like French, maybe TDD''s work could be helpful:
http://www.tddsworld.com/blogs/eapc/?2006/11/20/506-bien-developper-pour-le-web-20

No, I didn''t read it yet, but, as TDD is a fellow Prototype brethren, I
hope
he did write something about Enumerable too. Christophe? ;-)

Besides the official documentation (prototypejs.org), there''s also a
fine
Enumerable and Hash tutorial written by Justin Palmer at:
http://encytemedia.com/blog/articles/2005/12/07/prototype-meets-ruby-a-look-at-enumerable-array-and-hash

HTH
- --
Marius Feraru
-----BEGIN PGP SIGNATURE-----

iD8DBQFFwwgetZHp/AYZiNkRAvEdAJ9FWW9uB8w7w4xcF/eV+ii0Fg+NMgCg19co
5vqVozsgIplb8anPguBOlAc=3GMB
-----END PGP SIGNATURE-----

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Spinoffs" group.
To post to this group, send email to
rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-spinoffs?hl=en
-~----------~----~----~----~------~----~------~--~---

Hey guys,

Marius Feraru a écrit :
> As your name sounds like French, maybe TDD''s work could be
helpful:
>
http://www.tddsworld.com/blogs/eapc/?2006/11/20/506-bien-developper-pour-le-web-20
Thanks for the spotlight, Marius :-)
> 
> No, I didn''t read it yet, but, as TDD is a fellow Prototype
brethren, I hope
> he did write something about Enumerable too. Christophe? ;-)
Chapters 4 and 6 cover Prototype 1.5_pre0 extensively (final draft was 
due on Sep 11), including Enumerable of course (which didn''t have
size()
yet, but hey!). Aside from a typo in the syntax block for include/member 
(stating the arg is an iterator, when it is in fact a regular value), 
it''s good :-)

-- 
Christophe Porteneuve aka TDD
tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Spinoffs" group.
To post to this group, send email to
rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-spinoffs?hl=en
-~----------~----~----~----~------~----~------~--~---

Thanks for links, I already saw them.

My question was only a need of confirmation that the best way /
regular way to do what I want to do is to use find(). I think it is.

My other question about prototype version was also a confirmation. I
think that doing a "return in each()" in prototype 1.4 was not the
same behavior than in 1.5. But may be I mistake I don''t remember...

Why this last question ? Because I may have to review all my
JavaScript code If this behavior between 1.4 and 1.5 have change.

Regards

> > - So now I should use find() and my function should return true or
false ?
> You really sound like desperately needing an Enumerable tutorial :))
> As your name sounds like French, maybe TDD''s work could be
helpful:
>
http://www.tddsworld.com/blogs/eapc/?2006/11/20/506-bien-developper-pour-le-web-20
>
> No, I didn''t read it yet, but, as TDD is a fellow Prototype
brethren, I hope
> he did write something about Enumerable too. Christophe? ;-)
>
> Besides the official documentation (prototypejs.org), there''s also
a fine
> Enumerable and Hash tutorial written by Justin Palmer at:
>
http://encytemedia.com/blog/articles/2005/12/07/prototype-meets-ruby-a-look-at-enumerable-array-and-hash
>
> HTH
> - --
> Marius Feraru
> -----BEGIN PGP SIGNATURE-----
>
> iD8DBQFFwwgetZHp/AYZiNkRAvEdAJ9FWW9uB8w7w4xcF/eV+ii0Fg+NMgCg19co
> 5vqVozsgIplb8anPguBOlAc> =3GMB
> -----END PGP SIGNATURE-----
>
> >
>

-- 
Jean-Philippe Encausse - R&D Jalios SA
Jp [at] encausse.net - http://www.encausse.com - http://www.jalias.com
GTalk: jp.encausse [at] gmail.com - SMS: sms [at] jp.encausse.net
Mob: +33 6 82 12 56 99 Jalios: +33 1 39 23 92 83 Tel: +33 1 39 18 90 15
Do it Once, Use it Twice ~ Do it Twice, Make It Once

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Spinoffs" group.
To post to this group, send email to
rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-spinoffs?hl=en
-~----------~----~----~----~------~----~------~--~---

Hey Jean-Philippe,

Jean-Philippe Encausse a écrit :
> My question was only a need of confirmation that the best way /
> regular way to do what I want to do is to use find(). I think it is.
Well, yes.  There are many, many uses cases that are best served by 
specific methods in Enumerable instead of a run-of-the-mill each... 
Just look at invoke and pluck, for instance! (not for your current need, 
though).
> My other question about prototype version was also a confirmation. I
> think that doing a "return in each()" in prototype 1.4 was not
the
> same behavior than in 1.5. But may be I mistake I don''t
remember...
Actually, it worked exactly the same way.

-- 
Christophe Porteneuve aka TDD
tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Spinoffs" group.
To post to this group, send email to
rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-spinoffs?hl=en
-~----------~----~----~----~------~----~------~--~---