The syntaxes @a->[...] and %h->{...} have now been deprecated

rakesh1377 has asked for the wisdom of the Perl Monks concerning the following question:

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Re: The syntaxes @a->[...] and %h->{...} have now been deprecated by BrowserUk (Patriarch) on Jun 11, 2003 at 12:34 UTC
`$a->[...];` `$h->{...};` This has always been the correct syntax. The forms you show only worked because of an ommision. There was a recent thread discussing this %h->{foo} vs. $h{foo}.. which you may like to read as it will save it being repeated again here. Examine what is said, not who speaks. "Efficiency is intelligent laziness." -David Dunham "When I'm working on a problem, I never think about beauty. I think only how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong." -Richard Buckminster Fuller	[reply] [d/l] [select]
Re: Re: The syntaxes @a->[...] and %h->{...} have now been deprecated by rakesh1377 (Novice) on Jun 12, 2003 at 07:28 UTC
Thank you very much. My query is now resolved.	[reply]
Re: The syntaxes @a->[...] and %h->{...} have now been deprecated by tachyon (Chancellor) on Jun 11, 2003 at 12:31 UTC
`@a = ( 0, 1, 2, 3, 4 ); print 'could ', @a->[2], $/; print 'use ', $a[2], $/; print 'or(bad)', @a[2], $/;` [download] The 'bad' syntax works but gets a single element 'slice' and is in array (not scalar) context which may behave in slightly unexpected ways for which I can not generate a one line example. Same holds for hashes `$h{foo} instead of %h->{foo}` cheers tachyon s&&rsenoyhcatreve&&&s&n.+t&"$'$`$\"$\&"&ee&&y&srve&&d&&print	[reply] [d/l] [select]
Re: Re: The syntaxes @a->[...] and %h->{...} have now been deprecated by sauoq (Abbot) on Jun 11, 2003 at 16:57 UTC
The 'bad' syntax works but gets a single element 'slice' and is in array (not scalar) context which may behave in slightly unexpected ways for which I can not generate a one line example. I don't think this really has anything to do with slices. Nor is it a matter of context. It's just a syntactical freak of Perl nature... Frankenstyle. Some examples: perl -le '@foo = qw( f o o ); print @foo->[0]' # Frankenstyle perl -le '@foo = qw( f o o ); print @foo->[0,1,2]' # Frankenslice? perl -le '@foo = qw( f o o ); print @foo[0,1,2]' # Working slice. #### And a demo of context... perl -wle 'sub c {print wantarray ? "list" : "scalar" } my @foo; @foo += c;' perl -wle 'sub c {print wantarray ? "list" : "scalar" } my @foo; $foo[ +0] = c;' perl -wle 'sub c {print wantarray ? "list" : "scalar" } my @foo; @foo[ +0,1] = c;' # And Frankenstyle.... perl -wle 'sub c {print wantarray ? "list" : "scalar" } my @foo; @foo- +>[0] = c;' [download] -sauoq "My two cents aren't worth a dime.";	[reply] [d/l]
Re: The syntaxes @a->[...] and %h->{...} have now been deprecated by nite_man (Deacon) on Jun 11, 2003 at 12:41 UTC
`$a->[0] and $h->{first}` [download] or `$$a[0] and $$h{first}` [download] Look at perlref. -------------------------------- SV* sv_bless(SV* sv, HV* stash);	[reply] [d/l] [select]
Re: The syntaxes @a->[...] and %h->{...} have now been deprecated by Aragorn (Curate) on Jun 11, 2003 at 13:15 UTC
In for example Perl 5.005, this gets executes without problems: `#!/usr/bin/perl -w use strict; my @ary = qw(one two three); my %hash = (one => "One", two => "Two", three => "Three"); print @ary->[0]; print %hash->{one};` [download] Perl 5.005 doesn't complain at all, but 5.8.0 (rightly) complains about it. Use either arrays (hashes) or array (hash) references, and not some weird mix of the 2. Arjen	[reply] [d/l]
Re: The syntaxes @a->[...] and %h->{...} have now been deprecated by Skeeve (Parson) on Jun 11, 2003 at 12:16 UTC
I never saw that syntax. What should it mean? Do you mean something like %$h->{...} and not %h->{...}?	[reply]
Re: Re: The syntaxes @a->[...] and %h->{...} have now been deprecated by rakesh1377 (Novice) on Jun 11, 2003 at 12:22 UTC
Even I also don't know. perl 5.8 release document says...... Using arrays or hashes as references (e.g. "%foo->{bar}" has been deprecated for a while. Now you will get an optional warning.	[reply]
Re: The syntaxes @a->[...] and %h->{...} have now been deprecated by rakesh1377 (Novice) on Jun 11, 2003 at 12:25 UTC
Perl 5.8 release document says...... Using arrays or hashes as references (e.g. "%foo->{bar}" has been deprecated for a while. Now you will get an optional warning.	[reply]