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Re^2: passing arrays to subroutines

by Anonymous Monk
on Mar 16, 2005 at 13:16 UTC ( #439933=note: print w/replies, xml ) Need Help??

in reply to Re: passing arrays to subroutines
in thread passing arrays to subroutines

That doesn't pass an array into the sub. It passes a list into the sub. In fact, you cannot pass an array into a sub in Perl - the best you can do is passing a reference, either explicitely using \ (caller in charge), or implicitely using a prototype (callee in charge).

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Re^3: passing arrays to subroutines
by tlm (Prior) on Mar 16, 2005 at 14:26 UTC

    Just to expand on this point for the OP's benefit, consider:

    use strict; use Dumpvalue; my $dumper = Dumpvalue->new(); my @a = (3, 1, 4, 1); my @b = (5, 9); my @c = (2, 6, 5); sub ex1 { map 10*$_, @_; } $dumper->dumpValue([ex1(@a)]); print "\n"; # array refs sub ex2 { map scalar @$_, @_; } $dumper->dumpValue([ex2(\@a, \@b, \@c)]); print "\n"; # implicit array refs through prototypes sub ex3 (\@\@\@) { map scalar @$_, @_; } $dumper->dumpValue([ex3(@a, @b, @c)]); print "\n"; __END__ 0 30 1 10 2 40 3 10 0 4 1 2 2 3 0 4 1 2 2 3
    Note that the bodies of ex2 and ex3 are identical. IMO, however, ex2 is superior, because it can take as arguments any number of array refs, whereas ex3 must take exactly three arrays as arguments.

    Follow-up question: is there any way to define a sub that takes as input one or more arrays?

    the lowliest monk

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