> map ... iterates the entire list and you can't break out of it.
> I think it's only a viable
> solution in the limited case of a for loop that doesn't have a stopping case
Right, 'map' per se is for when you DO want to do it all.
The
map {statement} @List ;
naturally replaces
statement for @List ;
not the 'for ($i=0;$i;$i++) {...} '
nor 'while/last' loops
nor even for my $x (@List){ ... last ...} )
> As for recursion, I don't think one can easily replace a recursive solution
> with map.
In functional programming communities, map is initially implemented as, is
defined as if built as, and replaces, the classic recursion.
Map is a SWIM DRY replacement for recursion in that world view.
> Replacing recursion with iteration requires a base
> condition (and, possibly, a stack)
Recursion requires those, but many uses do not require them.
You are correct that map{}grep{}@List is the functional/applicative filter
solution.
> and map doesn't handle stopping conditions.
True.
Which simplifies the code template.
Why pay for it when you don't need it.
> One could work around it, I suppose, but not cheaply and the code would almost
> certainly be tasteless.
The functional form that shortcuts is really, really ugly :-)
use List::Util qw(first);
...
$foo = first { $_ >= $minimum } @list ;
Bill @ $dayJob // not speaking for $Firm
_______________________________________________
Boston-pm mailing list
[email protected]
http://mail.pm.org/mailman/listinfo/boston-pm
