You could call this part 2 of Function Prototype Context Conversion. Another bit of code which may not operate exactly as you would assume. This one is a little more challenging: 
#!/usr/bin/perl -w

use strict;

sub foo($) { print "$_[0]\n"; }

my @foo_bar = qw[ foo bar ];

sub returns_array  { return @foo_bar;              }
sub returns_two    { return qw[ foo bar ];         }
sub returns_two_2  { return ('foo','bar');         }

foreach ('foo(@foo_bar);',
         'foo($foo_bar[0..$#foo_bar]);',
         'foo(@foo_bar[0,$#foo_bar]);',
         'foo("foo","bar");',
         'foo(map{$_}"foo","bar");',
         'foo(qw[ foo bar ]);',
         'foo(@{[qw[ foo bar ]]});',
         'foo(${[qw[ foo bar ]]}[0,1]);',
         'foo(map{$_}qw[ foo bar ]);',
         'foo(reverse @foo_bar);',
         'foo(returns_two());',
         'foo(returns_two_2());',
         'foo(returns_array());')
{
        printf("%-30s : ", $_);
        eval($_) || print "# $@\n";
}

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There's some errors/warnings in there, just to keep things exciting.


The output of this program is hidden in this grey box: 
foo(@foo_bar);                 : 2
Argument "" isn't numeric in array element at (eval 2) line 1.
foo($foo_bar[0..$#foo_bar]);   : foo
foo(@foo_bar[0,$#foo_bar]);    : bar
foo("foo","bar");              : # Too many arguments for main::foo at
+ (eval 4) line 1, near ""bar")"

foo(map{$_}"foo","bar");       : 2
Useless use of a constant in void context at (eval 6) line 1.
foo(qw[ foo bar ]);            : bar
foo(@{[qw[ foo bar ]]});       : 2
foo(${[qw[ foo bar ]]}[0,1]);  : bar
foo(map{$_}qw[ foo bar ]);     : 2
foo(reverse @foo_bar);         : raboof
foo(returns_two());            : bar
foo(returns_two_2());          : bar
foo(returns_array());          : 2

[download]
The question is, is there a simple method to convert or expand an array into a list? If you know the number of elements in advance, sure, this is simple, but what about the general case?

In reply to Function Prototypes and Array vs. List (Pt. 2) by tadman

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