From: Jean Helou <jean.helou@...>
Date: 2007-01-05T18:40:38+09:00
Subject: Re: puts returns nil?

because you only call say_moo once.

x = say_moo 3

the interpreter will resolve and execute the method call and will
store the _result_ in x thus say_moo is called once and x is set to
the string "Yellow submarine"

puts x

this will only print the content of x which is a string and won't call
say_moo another time

did it help ?

jean

On 1/5/07, Arfon Smith <arfon.smith@gmail.com> wrote:
> Hi, I'm sorry to be asking such a daft question but I need a concept
> explaining....
>
>
> I'm working through the excellent Chris Pine book 'Learn to program' and
> I don't get one of the examples he gives.  In particular I don't follow
> the following example:
>
>
> def say_moo number_of_moos
>   puts 'mooooooo...' * number_of_moos
>   'yellow submarine'
> end
>
> x = say_moo 3
> puts x.capitalize + ', dude...'
> puts x + '.'
>
> Now the output from this is:
>
> mooooooo...mooooooo...mooooooo
> Yellow submarine, dude...
> yellow submarine
>
> -------------
>
> OK, so here's the problem, I _don't_ get why it doesn't return the
> following:
>
>
> mooooooo...mooooooo...mooooooo
> Yellow submarine, dude...
> mooooooo...mooooooo...mooooooo
> yellow submarine
>
> -------------
>
> Why do we get one set of 'moos' but not a second?
>
> Sorry for such a newbiee question.
>
> Cheers
>
> arfon
>
> --
> Posted via http://www.ruby-forum.com/.
>
>