Creating new instance from class // Syntax irritates me

[Ugur]

Hello there,

I am totally new to Ruby and saw this syntax which is creating a new instance from a class?

(quote)
mail = Mail.new do
to 'mi...@test.lindsaar.net'
from 'a...@test.lindsaar.net'
subject 'testing sendmail'
body 'testing sendmail'
end

mail.deliver
(/quote)
This example is taken from [1]

The tokens "to, from, subject, body" are whitespace seperated from the values on the right hand side. But no comma or arrow in between.

Can anyone explain this syntax to me? I checked [2] and couldn't find anything similir.

Thanks for any help,
Ugur

[1] http://lindsaar.net/2010/3/15/how_to_use_mail_and_actionmailer_3_with_gmail_smtp
[2] http://www.ruby-doc.org/docs/ProgrammingRuby/html/tut_classes.html

[Simon Krahnke]

* Ugur <ugur....@gmail.com> (2013-05-20) schrieb:

>Hello there,
>
>I am totally new to Ruby and saw this syntax which is creating a new instance from a class?
>
>(quote)
>mail = Mail.new do
> to 'mi...@test.lindsaar.net'
> from 'a...@test.lindsaar.net'
> subject 'testing sendmail'
> body 'testing sendmail'
>end

Well, the mail is simply created by Mail.new, the do ... end part is a
block given to the constructor that it uses to intialize some fields in
the mail.

"to 'mi...@test.lindsaar.net'" is a method call on self called "to",
with the argument 'mi...@test.lindsaar.net'.

The trick to achieve self to be set to something other than the value it
had during definition seems to be done using #instance_eval.

mfg, simon .... l

[do...@nodally.com]

As Simon says these are method calls not parameters. This syntax might be easier to follow:

m = Mail.new

m.to('mi...@test.lindsaar.net')
m.from('a...@test.lindsaar.net')
m.subject('testing sendmail')
m.body('testing sendmail')

m.deliver

Cheers,
Doug