From: Roy Sutton <roys@...>
Date: 2006-04-12T14:16:45+09:00
Subject: Re: Smalltalk's favorite Boolean method

What about:

case (1 == 2)
  when true:
     p 'true'
  when false:
     p 'false'
end

If you don't like the ternary operator the above syntax is pretty clear.

Roy

Ernest Micklei wrote:
> Hi,
>
> For a long time I have been programming Smalltalk.
> Recently, Ruby "got me" and I was wondering how the
> famous ifTrue:ifFalse: could be added to the System.
>
> 1 = 2
>   ifTrue:
>    [Transcript show: "true!" ]
>   ifFalse:
>    [Transcript show: "false!"]
>
> So at least the following works but I was hoping that it would have the 
> same elegance. "proc" was needed to create a real block instance.
>
> ------------------
> def true.ifTrue_ifFalse(trueBlock , falseBlock)
> 	trueBlock.call
> end
>
> def false.ifTrue_ifFalse(trueBlock , falseBlock)
> 	falseBlock.call
> end
>
> (1==2).ifTrue_ifFalse(
>    proc { p "true!"},
>    proc { p "false!"}
> )
>
> (1!=2).ifTrue_ifFalse(
>    proc { p "true!"},
>    proc { p "false!"}
> )
>
>