[squeak-dev] Re: [Pharo-project] Protocol extension proposal: Boolean>>asBit ?

Levente Uzonyi leves at elte.hu
Sat Dec 5 13:57:00 UTC 2009


On Sat, 5 Dec 2009, Igor Stasenko wrote:

> I currently writing a code which looks like:
>
> a := some numeric expression + (someBoolean ifTrue: [1] ifFalse: [0]).
>
> And i get somewhat tired repeating the same pattern in multiple places.
> So, i thinking , maybe #asBit convenience method could be useful?
>

It's useful IMO, so I use it whenever I need it. It's in the image 
with 7/1/2004 timestamp.


Levente

> True>>asBit
>  ^ 1
> False>>asBit
>  ^ 0
>
> so, then, in case of need like above, we could write much shorter expressions:
> a := some numeric expression + someBoolean asBit.
>
> And its much less error prone comparing to #ifTrue:ifFalse:, since i
> found its relatively easy to make a mess (swapping 1 with 0),
> especially, when you having negations in expression, because once you see:
>
> (someBoolean not ifTrue: [1] ifFalse: [0])
>
> you always tempted to write it as:
>
> (someBoolean ifTrue: [0] ifFalse: [1]).
>
> or as:
>
> (someBoolean ifFalse: [1] ifTrue: [0]).
>
> but once you start playing with it, its very easy to shoot into own
> feet if you are not careful.
>
> But if we could add #asBit, then we could write:
>
> someBoolean not asBit
>
> which is much more:
> a) concise & cleaner
> b) error proof
>
>
> -- 
> Best regards,
> Igor Stasenko AKA sig.
>
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