[OpenSCAD] Any where to find the doc for lc-each, lc-else and lc-for-c ?
rcmpersiano at gmail.com
Mon Oct 31 09:03:52 EDT 2016
I transcribe here an example of the benefits of the if-else I had used a few
ago to argue its need. The following list comprehension filter in the new
> if ( A ) ( if( B ) x else if (C) y ) else z
could be expressed in the old one by:
> if ( B || C ) !A ? z : B ? x : y
which is rather cryptic and hard to write. Besides, if we change the first
code eliminating the 'else z' part, the standard code will change to:
> if ( A ) if(B || C) B ? x: y
which is far from an obvious change.
>> a %2==0? a:
>> if (a!=1) a*10
> I'd like this form better, because it sort of focusing the feature of "if"
> as a filter that discards something, but not "sometimes it discards,
> sometimes it picks it back up when else is added".
I agree that the list comprehension 'if' is not always a filter in the new
syntax. But in your alternative the construct ?: would not always be an
expression if it is composed with a filter 'if'. If we extend the usage of
conditional expressions as you propose why not in other expressions too?
> [ for(a=A) a+(if (a==0) 1) ]
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