From: "David A. Black" <dblack@...>
Date: 2008-04-23T20:02:01+09:00
Subject: Re: Ruby and object paradigm

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Hi --

On Wed, 23 Apr 2008, Pe=F1a, Botp wrote:

> From: Andres [mailto:andresgaragiola@gmail.com]
> # I=B4m a smalltalk developer and now i'm beginning with Ruby. I found
>
> smalltalk is cool.
>
> # words like "puts" on the ruby syntax that i don=B4t understand.
>
> rtfm ;)
>
> # The basic object paradigm formula is "receiver + message", an emisor
> # send a message to a receiver.
>
> yes. but ruby is nice.  it does not "forces" us to do things just because=
 of some oo paradigm.. remember, not everyone view the programming world as=
 receiver.message only; eg, i feel at ease writing 1+1 instead of 1.+ 1 ;)
>
>
> # is
> #  Transcript show: 'Hello world'
>
> if you want a longer way, no problem.
>
> 070:0> Kernel.puts "hello"
> hello
> =3D> nil
>
> note, other objects may implem puts too, but you already know that ;)
>
> #  factorial
> #    ^self =3D 0 ifTrue: [ 1 ] ifFalse: [ self * ((self-1) factorial) ]
>
> another way in ruby
>
> 059:1>   def factorial
> 060:2>     self=3D=3D0 ? 1 : self * (self-1).factorial
> 061:2>   end
> =3D> nil
>
>
> # the message #ifTrue:ifFalse: is implemented in the class Boolean and
> # in his subclasses, and receive two block argmuments, the behavior if
> # the boolean is true and the behavior if the boolean is false. I don=B4t
> # understand like it works in ruby, when is implemented the message "if
> # else"?
>
> 1 current ruby does not support multiple blocks as arguments

I would say that Ruby doesn't support multiple blocks as blocks, but
it does support multiple Proc objects as arguments, if you want to go
that route.


David

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