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Postings from February 2002
On Tue, Feb 26, 2002 at 02:20:48PM -0800, Brent Dax wrote:
> Austin Hastings:
> #
> # Which, then, would you like:
> #
> # To implicitly localize $_, losing access to an outer version,
> # or to have to change between implicit and explicit operations?
Well, I like the idea of having C<when> and the C<s///> operate on the
same thing. But I don't really want C<when> to either localize or
clobber $_, I want it to leave the information structure alone. That's
why I'd alias $_ at the C<given> or the C<for>, just like I would now.
> # > given $y {
> # > when /a/ {...}
> # > when /b/ {...}
> # > ...
> # > }
>
> That's easy to fix in one of two ways:
>
> for @A -> $y {
> for @B -> $x {
$y =~ s/x/y/;
$x =~ s/x/y/;
> ...
> }
> }
Which gives you no defaults, but the ultimate in clarity and control.
> # for @A {
> # for @B -> $x {
> # when /a/ { s/x/y/; }
s/x/y/;
> # }
> # }
> #
> # What should that do?
Even if we give C<when> aliasing powers, it is still confusing, because
you jump back and forth between the $_ within the C<when> block and the
$_ between C<when> blocks.
Allison
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