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Re^3: simple anonymous subroutine and variable interpolation timing question

by ikegami (Patriarch)
on Jun 23, 2011 at 21:24 UTC ( [id://911173] : note . print w/replies, xml ) Need Help??


in reply to Re^2: simple anonymous subroutine and variable interpolation timing question
in thread simple anonymous subroutine and variable interpolation timing question

You don't have to create a separate sub. Alternatives:

my $sub = sub { my ($str) = @_; sub { $str } }->($str);
my $sub = sub { my $str = $str; sub { $str } }->();
my $sub = do { my $str = $str; sub { $str } };
my $str_copy = $str; my $sub = sub { $str_copy };

In practice, it's usually a non-issue since you either have a variable that doesn't change to begin with

for my $str (...) { ... sub { ... $str ... } ... }
or you want to factor out the code to a sub anyway.
sub make_list_iterator { my @list = @_; return sub { return @list ? shift(@list) : (); }; } my $iter = make_list_iterator(@list);