Re: [Pharo-users] Non-evaluating and / or

[Jan B.]

Of course, how could I have missed it before, thank you both :)

Jan


Blondeau Vincent wrote
> Hello,
> 
> You should but a block after "and:".
> If you don't, the instruction will be always executed...
> The block represents a kind of conditional action.
> 
> So if you want to do it works :
> false and: [ Transcript open ]
> 
> Hoping that it will help,
> 
> Best,
> Vincent BLONDEAU


Peter Uhnák wrote
> Hi,
> 
> that's because you need to pass a block, since you want to postpone to
> execution.
> i.e. false and: [Transcript open]. (otherwise the binary operation
> Transcript open will take precedence over keyword false and:)
> You can always look at the implementation of those things — I always learn
> something from it. :)
> 
> »and: alternativeBlock«
> 
> Peter





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Re: [Pharo-users] Non-evaluating and / or

[Peter Uhnák]

Hi,

that's because you need to pass a block, since you want to postpone to
execution.
i.e. false and: [Transcript open]. (otherwise the binary operation
Transcript open will take precedence over keyword false and:)
You can always look at the implementation of those things — I always learn
something from it. :)

»and: alternativeBlock«

Peter

On Fri, Apr 3, 2015 at 12:10 PM, Jan B.  wrote:

> Hello
>
> I would like to ask how to do non-evaluating and.
> As far as I know, & should be evaluating and and: should be non-evaluating.
> However, I need to find a way how to use it properly.
>
> In "conventional" languages I would expect to work it like in following
> example...
>   false and: Transcript open
> Since false is... false... there is no reason to evaluate Transcript open.
> But when I run this one in playground, transcript opens.
>
> Any help is appreciated.
>
> Jan
>
>
>
> --
> View this message in context:
> http://forum.world.st/Non-evaluating-and-or-tp4817211.html
> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.
>
>

Re: [Pharo-users] Non-evaluating and / or

[Blondeau Vincent]

Hello,

You should but a block after "and:".
If you don't, the instruction will be always executed...
The block represents a kind of conditional action.

So if you want to do it works :
false and: [ Transcript open ]

Hoping that it will help,

Best,
Vincent BLONDEAU

-Message d'origine-
De : Pharo-users [mailto:pharo-users-boun...@lists.pharo.org] De la part de Jan 
B.
Envoyé : vendredi 3 avril 2015 12:10
À : pharo-users@lists.pharo.org
Objet : [Pharo-users] Non-evaluating and / or

Hello

I would like to ask how to do non-evaluating and.
As far as I know, & should be evaluating and and: should be non-evaluating.
However, I need to find a way how to use it properly.

In "conventional" languages I would expect to work it like in following 
example...
  false and: Transcript open
Since false is... false... there is no reason to evaluate Transcript open.
But when I run this one in playground, transcript opens.

Any help is appreciated.

Jan



--
View this message in context: 
http://forum.world.st/Non-evaluating-and-or-tp4817211.html
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