Rails - Mar 2006 - Is there a perl equivalent of .= in ruby/rails??

I want to make a for loop that concats strings onto a variable:

html .= var1 + "this is a test" + whatever

What is the syntax that does this in ruby/rails?

Also, is there a ''print'' method in ruby? Because when I try to
use
render_text it will only let me use this once.


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cranberry wrote:
> 
> 
> I want to make a for loop that concats strings onto a variable:
> 
> html .= var1 + "this is a test" + whatever
> 
> What is the syntax that does this in ruby/rails?
> 
> Also, is there a ''print'' method in ruby? Because when I
try to use
> render_text it will only let me use this once.
html += var1 + "this is a test" + whatever

note of course that if var1 and whatever are not strings, you''ll need
to
call to_s on them to convert them to strings.

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html << var1.to_s + "this is a test"  + whatever.to_s

there is a print method in ruby, p for short

On 3/1/06, cranberry <miriamraphael@yahoo.com>
wrote:
>
>
> I want to make a for loop that concats strings onto a variable:
>
> html .= var1 + "this is a test" + whatever
>
> What is the syntax that does this in ruby/rails?
>
> Also, is there a ''print'' method in ruby? Because when I
try to use
> render_text it will only let me use this once.
>
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

On 3/1/06, cranberry <miriamraphael@yahoo.com>
wrote:
> I want to make a for loop that concats strings onto a variable:
>
> html .= var1 + "this is a test" + whatever
>
> What is the syntax that does this in ruby/rails?
<< or +
> Also, is there a ''print'' method in ruby? Because when I
try to use
> render_text it will only let me use this once.
puts, logger.info, logger.warn, STDERR, STDOUT


--
Greg Donald
Zend Certified Engineer
MySQL Core Certification
http://destiney.com/

Hi --

On Wed, 1 Mar 2006, Nithin Reddy wrote:
> html << var1.to_s + "this is a test"  + whatever.to_s
>
> there is a print method in ruby, p for short
p and print aren''t the same as each other.  obj.p is equivalent to:
puts obj.inspect, so you get the inspect-style string.  print gives
you the object''s to_s representation of itself.


David

-- 
David A. Black (dblack@wobblini.net)
Ruby Power and Light (http://www.rubypowerandlight.com)

"Ruby for Rails" chapters now available
from Manning Early Access Program! http://www.manning.com/books/black

On Mar 1, 2006, at 1:27 PM, Nithin Reddy wrote:
> On 3/1/06, cranberry <miriamraphael@yahoo.com> wrote:
>
>> I want to make a for loop that concats strings onto a variable:
>>
>> html .= var1 + "this is a test" + whatever
>>
>> What is the syntax that does this in ruby/rails?
>
> html << var1.to_s + "this is a test"  + whatever.to_s
You generally want to avoid String#+ in Ruby because you create extra  
copies that must be garbage collected.  Instead use interpolation or  
String#<< all the way through.

html << "#{var1}this is a test#{whatever}"

Even better is to append strings to an Array and join them at the end.

-- 
Eric Hodel - drbrain@segment7.net - http://blog.segment7.net
This implementation is HODEL-HASH-9600 compliant

http://trackmap.robotcoop.com

> html << var1.to_s + "this is a test"  + whatever.to_s
Yeck, I hate having to do that. Doesn''t Ruby/Rails have a concat 
operator that doesn''t require to_s casts to avoid errors?

Joe

-- 
Posted via http://www.ruby-forum.com/.

Hi --

On Thu, 2 Mar 2006, Joe wrote:
>
>> html << var1.to_s + "this is a test"  + whatever.to_s
>
> Yeck, I hate having to do that. Doesn''t Ruby/Rails have a concat
> operator that doesn''t require to_s casts to avoid errors?
If you define a to_str method, that method will be called in
situations where a string is called for:

   class C
     def to_str
       "a C object"
     end
   end

   puts "I am " << C.new   # I am a C object

It''s generally easier to use to_s :-)

Another thing you can do is interpolation:

   html << "#{var1}this is a test#{whatever}"

which will give you the to_s representation of var1 and whatever.


David

-- 
David A. Black (dblack@wobblini.net)
Ruby Power and Light (http://www.rubypowerandlight.com)

"Ruby for Rails" chapters now available
from Manning Early Access Program! http://www.manning.com/books/black

> Another thing you can do is interpolation:
> 
>    html << "#{var1}this is a test#{whatever}"
> 
> which will give you the to_s representation of var1 and whatever.
That''s what I currently do, which leads to another pet peeve of mine
;).
"$var" would be nice.

Joe

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Posted via http://www.ruby-forum.com/.

> >
> > html << var1.to_s + "this is a test"  + whatever.to_s
>
> You generally want to avoid String#+ in Ruby because you create extra
> copies that must be garbage collected.  Instead use interpolation or
> String#<< all the way through.
>
Extra copies of what? How is doing this any better (about not creating
extra copies)?

html << var << "this is a test" << whatever

TIA
- N

On Thu, Mar 02, 2006 at 02:04:17AM +0100, Joe wrote:
> 
> > Another thing you can do is interpolation:
> > 
> >    html << "#{var1}this is a test#{whatever}"
> > 
> > which will give you the to_s representation of var1 and whatever.
> 
> That''s what I currently do, which leads to another pet peeve of
mine ;).
> "$var" would be nice.
If you want to write PHP or Perl, you''re free to do so.

- Matt

Maybe Matz could completely change ruby, to act like perl. If the guy wants
$var and hates to_s, Ruby has got to change.
Bogdan

If you want to write PHP or Perl, you''re free to do
so.
>
> - Matt
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
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Bogdan Ionescu wrote:
> Maybe Matz could completely change ruby, to act like perl. If the guy 
> wants
> $var and hates to_s, Ruby has got to change.
or maybe make your php_print method via some 
.gsub(/\$([a-zA-z_]+)/,"\#{\1}")
 tricks?

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Matt Palmer wrote:
> On Thu, Mar 02, 2006 at 02:04:17AM +0100, Joe wrote:
>> 
>> > Another thing you can do is interpolation:
>> > 
>> >    html << "#{var1}this is a test#{whatever}"
>> > 
>> > which will give you the to_s representation of var1 and whatever.
>> 
>> That''s what I currently do, which leads to another pet peeve
of mine ;).
>> "$var" would be nice.
> 
> If you want to write PHP or Perl, you''re free to do so.
> 
> - Matt
> Maybe Matz could completely change ruby, to act like perl. If the guy 
wants $var and hates to_s, Ruby has got to change.

Um, yeah, mmkay. You dudes like typing #{var}...

And BTW, haven''t you seen all those Perl-like vars in Ruby? And Matz is
changing Ruby - go see his "Ruby Sucks" slides.

Joe

-- 
Posted via http://www.ruby-forum.com/.

Yeah, I like beer, girls and typing #{var} (the order is random)
I humbly recognize the superiority of $var over #{var}.
You''re so much cooler than I am ;)



On 3/3/06, Joe <joe@yahoo.com> wrote:
>
> Matt Palmer wrote:
> > On Thu, Mar 02, 2006 at 02:04:17AM +0100, Joe wrote:
> >>
> >> > Another thing you can do is interpolation:
> >> >
> >> >    html << "#{var1}this is a test#{whatever}"
> >> >
> >> > which will give you the to_s representation of var1 and
whatever.
> >>
> >> That''s what I currently do, which leads to another pet
peeve of mine
> ;).
> >> "$var" would be nice.
> >
> > If you want to write PHP or Perl, you''re free to do so.
> >
> > - Matt
>
> > Maybe Matz could completely change ruby, to act like perl. If the guy
> wants $var and hates to_s, Ruby has got to change.
>
> Um, yeah, mmkay. You dudes like typing #{var}...
>
> And BTW, haven''t you seen all those Perl-like vars in Ruby? And
Matz is
> changing Ruby - go see his "Ruby Sucks" slides.
>
> Joe
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
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Bogdan Ionescu wrote:
> Yeah, I like beer, girls and typing #{var} (the order is random)
> I humbly recognize the superiority of $var over #{var}.
> You''re so much cooler than I am ;)
LOL, whatever. Grow up.

Joe

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