Re: Problems with map(function, array)

in reply to Problems with map(function, array)

Nothing to do with map really. uc has magic!

In the following construct, uc is getting called with no parameters:

my @caps = map uc, @lower;
[download]

As per perlfunc, when called with no parameters, uc operates on $_. So you need to make your function act the same (as indeed you did in your second experiment).

From Perl 5.10 and above, there's a better technique to write such functions:

sub my_uc (_) {  # note underscore in parentheses
  my $c = shift;
  return uc($c);
}
[download]

And now my_uc has the same magic as uc.

perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In Section Seekers of Perl Wisdom