Steven D'Aprano <ste...@remove.this.cybersource.com.au> writes:
> On Wed, 17 Feb 2010 12:39:30 -0600, John Bokma wrote:
[..]
>> If it was Perl [1], I doubt it. Because line numbers are reported, and
>> if that doesn't help you, you can annotate anonymous functions with a
>> nick name using
>>
>> local *__ANON__ = 'nice name';
> [...]
>> As you can see, and a line number is generated, and the nice name is
>> shown.
>
> Given that it has a nice name, what makes it an anonymous function?
You can't do
nice name();
It just changes what perl reports.
> If this is the case, then your answer to "anonymous functions are a
> PITA"
I don't think anon functions are in general a
PITA. Like with most things, (I) use them in moderation.
> is "don't use anonymous functions", which exactly the same answer we'd
> give here in Python land. The only difference is that Perl provides two
> ways of making a named function, and Python only one[1].
Note that the local trick doesn't create a named function. There are
other ways of course to create named functions in Perl, e.g.
perl -e '*foo=sub { print "hello, world\n" }; foo();'
Which can be fun:
perl -e '
sub AUTOLOAD {
my $name = our $AUTOLOAD;
*$AUTOLOAD = sub { local $" = ", "; print "$name(@_)\n" };
goto &$AUTOLOAD;
}
foo(40);
bar("hello", "world!");
baz(foo(10));'
output:
main::foo(40)
main::bar(hello, world!)
main::foo(10)
main::baz(1)
NB: calling foo 10 returns 1 (return value of print).
--
John Bokma j3b
Hacking & Hiking in Mexico - http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development
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