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Tyler MacDonald

2007-Feb-23 02:37 UTC

ruby just pissed me off!

I guess it had to happen sometime...

but apparently, I can''t do

"return not condition"

i have to do

"return ! condition"

instead...

*grumbles*

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Marcel Molina Jr.

2007-Feb-23 02:38 UTC

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Re: ruby just pissed me off!

On Thu, Feb 22, 2007 at 06:37:31PM -0800, Tyler MacDonald
wrote:> 
> I guess it had to happen sometime...
> 
> but apparently, I can''t do
> 
> "return not condition"
> 
> i have to do
> 
> "return ! condition"
> 
> instead...
> 
> *grumbles*
return unless condition

marcel
-- 
Marcel Molina Jr. <marcel-WRrfy3IlpWYdnm+yROfE0A@public.gmane.org>

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Jamey Cribbs

2007-Feb-23 02:45 UTC

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Re: ruby just pissed me off!

Marcel Molina Jr. wrote:> On Thu, Feb 22, 2007 at 06:37:31PM -0800, Tyler MacDonald wrote:
>   
>> I guess it had to happen sometime...
>>
>> but apparently, I can''t do
>>
>> "return not condition"
>>
>> i have to do
>>
>> "return ! condition"
>>
>> instead...
>>
>> *grumbles*
>>     
>
> return unless condition
>
> marcel
>   
Ok, Tyler, tell Ruby you''re sorry.  ;-)

Jamey


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Tyler MacDonald

2007-Feb-23 02:50 UTC

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Re: ruby just pissed me off!

Marcel Molina Jr. <marcel-WRrfy3IlpWYdnm+yROfE0A@public.gmane.org>
wrote:> > but apparently, I can''t do
> > "return not condition"
> > i have to do
> > "return ! condition"
> > instead...
> return unless condition
Umm... doesnt that just restrict "return"ing to the condition being
false?
ie; wouldn''t I have to

return true unless condition
return false

if not... well... i''ve learned something new today :-)

	- Tyler

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Tyler MacDonald

2007-Feb-23 03:01 UTC

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Re: ruby just pissed me off!

Jamey Cribbs <jcribbs-5tZyCCM3m2VWk0Htik3J/w@public.gmane.org>
wrote:> > return unless condition
> Ok, Tyler, tell Ruby you''re sorry.  ;-)
I''m afraid I can''t.

def invert(huh)
   return unless huh
end

if invert false
   print "it worked!\n"
else
   print "it didn''t work\n"
end

yields "it didn''t work". :-(

it''s a small failing. but it still irks me. it''s okay though
ruby, I can
forgive you this one time.

	- Tyler

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Luke Ivers

2007-Feb-23 03:13 UTC

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Re: ruby just pissed me off!

It''s all about bind order:

return (not false) == return ! false

On 2/22/07, Tyler MacDonald
<google.com-oTuY4Vk9bUDG8MNy1oJpyw@public.gmane.org>
wrote:>
>
> Jamey Cribbs <jcribbs-5tZyCCM3m2VWk0Htik3J/w@public.gmane.org> wrote:
> > > return unless condition
> > Ok, Tyler, tell Ruby you''re sorry.  ;-)
>
> I''m afraid I can''t.
>
> def invert(huh)
>    return unless huh
> end
>
> if invert false
>    print "it worked!\n"
> else
>    print "it didn''t work\n"
> end
>
> yields "it didn''t work". :-(
>
> it''s a small failing. but it still irks me. it''s okay
though ruby, I can
> forgive you this one time.
>
>         - Tyler
>
> >
>
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Tyler MacDonald

2007-Feb-23 03:18 UTC

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Re: ruby just pissed me off!

Luke Ivers <technodolt-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> It''s all about bind order:
> 
> return (not false) == return ! false
Yes, those two are equivalent, because they both involve extraneous symbols
instead of pure expressive english!

Like I said, it''s a small thing. And the first thing that''s
really irked me,
even after I''ve learned it.

:-)

	- Tyler

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Marcel Molina Jr.

2007-Feb-23 03:19 UTC

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Re: ruby just pissed me off!

On Thu, Feb 22, 2007 at 07:01:11PM -0800, Tyler MacDonald
wrote:> 
> Jamey Cribbs <jcribbs-5tZyCCM3m2VWk0Htik3J/w@public.gmane.org> wrote:
> > > return unless condition
> > Ok, Tyler, tell Ruby you''re sorry.  ;-)
> 
> I''m afraid I can''t.
> 
> def invert(huh)
>    return unless huh
> end
> 
> if invert false
>    print "it worked!\n"
> else
>    print "it didn''t work\n"
> end
> 
> yields "it didn''t work". :-(
> 
> it''s a small failing. but it still irks me. it''s okay
though ruby, I can
> forgive you this one time.
I didn''t get what you wanted to do from your oringal email.

return unless condition 

will indeed return nil if the condition is true and therefore the result of
the method invocation will be boolean false, which is not what you had
wanted. 

Like another poster mentioned, not does not bind as tightly as !, so
you''d
have to use parens if you wanted to use not.

I find ''return not condition'' rather unnatural to read though.
If this were
the last line of a method I''d just get rid of the return entirely and
simply
do

!condition

marcel
-- 
Marcel Molina Jr. <marcel-WRrfy3IlpWYdnm+yROfE0A@public.gmane.org>

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Jamey Cribbs

2007-Feb-23 03:23 UTC

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Re: ruby just pissed me off!

Tyler MacDonald wrote:> Jamey Cribbs <jcribbs-5tZyCCM3m2VWk0Htik3J/w@public.gmane.org> wrote:
>   
>>> return unless condition
>>>       
>> Ok, Tyler, tell Ruby you''re sorry.  ;-)
>>     
>
> I''m afraid I can''t.
>
> def invert(huh)
>    return unless huh
> end
>
> if invert false
>    print "it worked!\n"
> else
>    print "it didn''t work\n"
> end
>
> yields "it didn''t work". :-(
>   
How about this:

def invert(huh)
    return huh ? false : true
end


Jamey


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Tyler MacDonald

2007-Feb-23 03:32 UTC

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Re: ruby just pissed me off!

Jamey Cribbs <jcribbs-5tZyCCM3m2VWk0Htik3J/w@public.gmane.org>
wrote:> How about this:
> 
> def invert(huh)
>     return huh ? false : true
> end
  That was a unit test...

  I''m sorry if this is wasting your guys'' time.. I was just
venting,
*really*. I''m just using "!" instead of "not"
now... it just seemed kind of
disappointing that "not" didn''t work.

	- Tyler

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andy.keep-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-Feb-23 12:34 UTC

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Re: ruby just pissed me off!

Tyler -- if this is at the end of the function, you don''t need the
return!

def test_func(foo)
     not foo
end

has the same effect you are going for -- (after all ruby has
functional language underpinnings)

-andy:)

On Feb 22, 10:32 pm, Tyler MacDonald
<google....-oTuY4Vk9bUDG8MNy1oJpyw@public.gmane.org>
wrote:> Jamey Cribbs <jcri...-5tZyCCM3m2VWk0Htik3J/w@public.gmane.org> wrote:
> > How about this:
>
> > def invert(huh)
> >     return huh ? false : true
> > end
>
>   That was a unit test...
>
>   I''m sorry if this is wasting your guys'' time.. I was
just venting,
> *really*. I''m just using "!" instead of "not"
now... it just seemed kind of
> disappointing that "not" didn''t work.
>
>         - Tyler

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andy.keep-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-Feb-23 12:58 UTC

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Re: ruby just pissed me off!

Although, just to add (now that I''ve had a few sips of coffee) I
remember being disappointed when I put "return not foo" the first time
and it didn''t know what I meant.  I mean.. return really should be at
the bottom of the barrel as far as order of operations is concerned.
Last to be evaluated.

-andy:)

On Feb 23, 7:34 am,
"andy.k...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org"
<andy.k...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Tyler -- if this is at the end of the function, you don''t need the
> return!
>
> def test_func(foo)
>      not foo
> end
>
> has the same effect you are going for -- (after all ruby has
> functional language underpinnings)
>
> -andy:)
>
> On Feb 22, 10:32 pm, Tyler MacDonald
<google....-oTuY4Vk9bUDG8MNy1oJpyw@public.gmane.org>
> wrote:
>
> > Jamey Cribbs <jcri...-5tZyCCM3m2VWk0Htik3J/w@public.gmane.org>
wrote:
> > > How about this:
>
> > > def invert(huh)
> > >     return huh ? false : true
> > > end
>
> >   That was a unit test...
>
> >   I''m sorry if this is wasting your guys'' time.. I
was just venting,
> > *really*. I''m just using "!" instead of
"not" now... it just seemed kind of
> > disappointing that "not" didn''t work.
>
> >         - Tyler

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chrisfarms

2007-Feb-23 14:05 UTC

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Re: ruby just pissed me off!

Ruby has lots of friends! .... look how quickly everyone came running
to defend :)



I personally try not to use a "return" unless my method is returning
prematurely.
and having the last line of a method read

  not condition

seems clearer than

  return not condition

... I also quite like !condition anyway



can this thread win some kind of OpinionBasedThread of the day
award :)



farms.

On Feb 23, 12:58 pm,
"andy.k...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org"
<andy.k...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Although, just to add (now that I''ve had a few sips of coffee) I
> remember being disappointed when I put "return not foo" the first
time
> and it didn''t know what I meant.  I mean.. return really should be
at
> the bottom of the barrel as far as order of operations is concerned.
> Last to be evaluated.
>
> -andy:)
>
> On Feb 23, 7:34 am,
"andy.k...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org"
<andy.k...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > Tyler -- if this is at the end of the function, you don''t
need the
> > return!
>
> > def test_func(foo)
> >      not foo
> > end
>
> > has the same effect you are going for -- (after all ruby has
> > functional language underpinnings)
>
> > -andy:)
>
> > On Feb 22, 10:32 pm, Tyler MacDonald
<google....-oTuY4Vk9bUDG8MNy1oJpyw@public.gmane.org>
> > wrote:
>
> > > Jamey Cribbs
<jcri...-5tZyCCM3m2VWk0Htik3J/w@public.gmane.org> wrote:
> > > > How about this:
>
> > > > def invert(huh)
> > > >     return huh ? false : true
> > > > end
>
> > >   That was a unit test...
>
> > >   I''m sorry if this is wasting your guys''
time.. I was just venting,
> > > *really*. I''m just using "!" instead of
"not" now... it just seemed kind of
> > > disappointing that "not" didn''t work.
>
> > >         - Tyler

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Jose Hales-Garcia

2007-Feb-23 14:43 UTC

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Re: ruby just pissed me off!

On Feb 22, 2007, at 6:37 PM, Tyler MacDonald wrote:
>
> I guess it had to happen sometime...
>
> but apparently, I can''t do
>
> "return not condition"
>
> i have to do
>
> "return ! condition"
>
> instead...
>
> *grumbles*
What is ''condition''?  It could be complicated and I think
it''s
affecting your outcome.  ''not'' is very low in precedence.  It
will be
polite and let everything in ''condition'' evaluate first. 
''!''
evaluates before most everything else.  Did you try doing...

return not (condition)

or

return (not condition)

Jose

.......................................................
Jose Hales-Garcia
UCLA Department of Statistics
jose-oNoWckAxTcaFhjwBz98joA@public.gmane.org





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Peter Ertl

2007-Feb-23 16:25 UTC

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Re: ruby just pissed me off!

class Object
  def not(value)
    !value
  end
end

this should help you out!


2007/2/23, Jose Hales-Garcia
<jose-oNoWckAxTcaFhjwBz98joA@public.gmane.org>:>
>
> On Feb 22, 2007, at 6:37 PM, Tyler MacDonald wrote:
>
>
> I guess it had to happen sometime...
>
> but apparently, I can''t do
>
> "return not condition"
>
> i have to do
>
> "return ! condition"
>
> instead...
>
> *grumbles*
>
>
> What is ''condition''?  It could be complicated and I think
it''s affecting
> your outcome.  ''not'' is very low in precedence.  It will
be polite and let
> everything in ''condition'' evaluate first. 
''!'' evaluates before most
> everything else.  Did you try doing...
>
> return not (condition)
>
> or
>
> return (not condition)
>
> Jose
>
> .......................................................
> Jose Hales-Garcia
> UCLA Department of Statistics
> jose-oNoWckAxTcaFhjwBz98joA@public.gmane.org
>
>
>
>
>
> >
>
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Rails - Feb 2007 - ruby just pissed me off!

ruby just pissed me off!

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