Re: shift on empty array in list context broken

Replies are listed 'Best First'.
Re^2: shift on empty array in list context broken by LanX (Saint) on Jul 13, 2019 at 21:22 UTC
> It doesn't look like shift has a list context, at least according to perldoc. well `splice` also says The following equivalences hold `... shift(@a) splice(@a,0,1)` [download] Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply] [d/l]
Re^3: shift on empty array in list context broken by tybalt89 (Monsignor) on Jul 13, 2019 at 21:30 UTC
`splice` lied! It's almost sort-of nearly true, but not completely true :)	[reply] [d/l]
Re^4: shift on empty array in list context broken by Anonymous Monk on Jul 13, 2019 at 21:48 UTC
splice didnt lie The array is manipulated exactly like shift would manipulate it. The return value is exactly as documented for splice/shift. The equivalences chart is part but not the whole documentation.	[reply]
Re^5: shift on empty array in list context broken by ikegami (Patriarch) on Jul 15, 2019 at 11:15 UTC
Re^6: shift on empty array in list context broken by Anonymous Monk on Jul 17, 2019 at 00:43 UTC
Some notes below your chosen depth have not been shown here
Re^4: shift on empty array in list context broken by LanX (Saint) on Jul 13, 2019 at 21:36 UTC
> splice lied! I prefer orthogonal design :/ Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply]
Re^3: shift on empty array in list context broken by tybalt89 (Monsignor) on Jul 13, 2019 at 21:38 UTC
On the other hand, try `my @x = (); my $x = splice @x, 0, 1;` [download] What splice says is true in scalar context.	[reply] [d/l]
Re^4: shift on empty array in list context broken by LanX (Saint) on Jul 13, 2019 at 22:21 UTC
what do you mean? `DB<17> ($x= splice @x, 0, 1 ) and print "true" DB<18> p !! splice @x, 0, 1 DB<19>` [download] it's false for me. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply] [d/l]
Re^5: shift on empty array in list context broken by dsheroh (Monsignor) on Jul 14, 2019 at 08:14 UTC
Re^3: shift on empty array in list context broken by ikegami (Patriarch) on Jul 15, 2019 at 11:17 UTC
That should be fixed. Feel free to use `perlbug` to submit a bug report. Please include a suggested fix.	[reply] [d/l]
Re^4: shift on empty array in list context broken by choroba (Cardinal) on Jul 23, 2019 at 15:55 UTC
Reported without a precise suggestion to fix. `map{substr$_->[0],$_->[1]\|\|0,1}[\\|\|{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^ARGV,3]`	[reply] [d/l]
Re^5: shift on empty array in list context broken by LanX (Saint) on Jul 23, 2019 at 16:00 UTC
Re^6: shift on empty array in list context broken by choroba (Cardinal) on Jul 23, 2019 at 16:08 UTC
Re^3: shift on empty array in list context broken by Don Coyote (Hermit) on Jul 21, 2019 at 14:08 UTC
>well splice also says > The following equivalences hold > ... > shift(@a) splice(@a,0,1) It would appear shift is doing something like this: `DB<232> x $x=4; while( ($y)= ( $u = splice( @t,0,1 ))){ last unless +$x--; print ":$_: " } :: :: :: :: empty array` [download] which would make the equivalence: `shift(@a) === ( $t = splice( @a,0,1 ) )` [download]	[reply] [d/l] [select]