--
On Fri, 7 Feb 2003 16:28:43
gpurdy wrote:
>All --
>
>A4 gives this example of C<for>:
>
> for @foo -> $a, $b { ... } # "for @foo into $a and $b..."
>
>but, this seems more natural to me (and, it turns out, closer to the P5
>syntax for ill or good):
>
> for $a, $b <- @foo { ... } # "for $a and $b from @foo..."
All else aside, I think that a <- will not
fly. It's too easily read as greater-than-unary-minus
-Erik
>
>(heck, that even looks like shifting -- "shifty aliasing". The A4 syntax
>looks like popping until you realize it is really shoving the left N
>thingees into the containers on the right -- Syntactical Action at a
>Distance).
>
>
>
>Then, A4 gives this example of C<grep>:
>
> grep -> $x { $x eq 3 } @list # "grep into $x, $ eq 3 from @list"
> # NOTE: String comparison to a number...
>
>But, this would match the C<for> example better, IMO (and puts the
>alias name near the source of the things it will be aliasing):
>
> grep { $x eq 3 } @list -> $x # "grep $x eq 3 where @list into $x"
>
>My guess is that Larry wanted $x to appear before the block it
>will be used in, and that C<grep>'s swapping of block and list
>(when compared to C<for>) makes doing so ugly (IMO).
>
>
>
>But, this would be more natural overall (again, IMO), following my
>suggestion for C<for>, above:
>
> grep { $x eq 3 } $x <- @list # "grep $x eq 3 where $x from @list"
>
>Whether what I suggest makes sense to anyone else or not, I do
>think the disparity between C<for> and C<grep> in A4 should be
>dealt with...
>
>------------------------------------------
>
>Oh, and A4 also says "Standard Perl declarations will be plainly
>marked with C<my> or C<our>." The C<< -> >> or C<< <- >> notation
>for what amounts to a C<my> should be mentioned nearby, IMO.
>
>------------------------------------------
>
>On another note, this would seem to be a handy statement modifier
>form for greppage:
>
> my @threes = @list when $_ eq 3; # NOTE "where" sounds better
>
>although appropriate aliasing syntax for this eludes me at the moment...
>
> my @threes = $x <- @list when $x eq 3;
>
>feels weird with the $x near the '='. And neither of these feels right
>either:
>
> my @threes = @list when -> $x { $x eq 3 }; # Close to A4 C<grep>
>ayntax
> my @threes = @list -> $x when $x eq 3; # Close to A4 C<for> syntax
>
>
>Regards,
>
>-- Gregor
>
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