Re^2: "last expression" quiz

If the last thing that happened was an iteration of the do {} while $cond or do {} until $cond pseudo-loop, you get back a code reference (whether the condition turned out true of false).

That sounds really strange, but sadly I can't reproduce it. I tried

perl -e 'print sub {my $x=5; do {print "."} while $x--}->()'
[download]

but the sub just seems to return 0. Can you give an example? (Also, what version of Perl are you using?)

Comment on Re^2: "last expression" quiz Download Code

Replies are listed 'Best First'.
Re^3: "last expression" quiz by Aristotle (Chancellor) on Oct 23, 2005 at 14:43 UTC
As the node you’re replying to already says: check Re^8: Unhappy returns for code. $ perl -v This is perl, v5.8.7 built for i486-linux Makeshifts last the longest.	[reply]
Re^4: "last expression" quiz by robin (Chaplain) on Oct 23, 2005 at 15:14 UTC
There is a bug in your code. You've missed out the `->()` in the last two cases, so it's printing the sub rather than the result of calling the sub.	[reply]
Re^5: "last expression" quiz by Aristotle (Chancellor) on Oct 27, 2005 at 05:37 UTC
Gack. Thanks for the catch. That was stupid. Fixed, node has been updated. The new behaviour is a tad more consistent, but still not consistent with the documentation. What gets returned is the last expression from the body of the `do`, while the last one evaluated is clearly the `while`/`until` condition. (Arguably, the real behaviour is more useful than the strictly doc-adherent one would be.) Makeshifts last the longest.	[reply]


Do you know where your variables are?
	PerlMonks