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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;

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); }

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 reply to Re: Problems with map(function, array) by tobyink
in thread Problems with map(function, array) by Redei

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