11 is(reverse("abc"), "cba", 'simple reverse');
14 is(reverse(), "raboof", 'reverse of the default variable');
17 my @a = ("foo", "bar");
20 is($b[0], $a[1], 'array reversal moved second element to first');
21 is($b[1], $a[0], 'array reversal moved first element to second');
27 is("@a", "4 3 2 1", 'four element array reversed');
31 ok(!exists $a[2], 'array reversed with deleted second element');
32 is($a[0] . $a[1] . $a[3], '124', 'remaining elements ok after delete and reverse');
36 is("@a", "9 8 7 6 5", 'five element array reversed');
40 ok(!exists $a[1], 'five element array reversed with deleted fourth element');
41 is($a[0] . $a[2] . $a[3] . $a[4], '5789', 'remaining elements ok after delete and reverse');
45 ok(!exists $a[2] && !exists $a[3], 'test position of two deleted elements after reversal');
46 is($a[0] . $a[1] . $a[4], '985', 'check value of remaining elements');
49 @empty = reverse @empty;
50 is("@empty", "", 'reversed empty array is still empty');
56 tie my @a, 'Tie::StdArray';
60 is("@a", "4 3 2 1", 'tie array reversal');
64 ok(!exists $a[2], 'deleted element position ok after reversal of tie array');
65 is($a[0] . $a[1] . $a[3], '124', 'remaining elements ok after delete and reversal for tie array');
69 is("@a", "9 8 7 6 5", 'five element tie array reversal');
73 ok(!exists $a[1], 'deleted element position ok after tie array reversal');
74 is($a[0] . $a[2] . $a[3] . $a[4], '5789', 'remaining elements ok after tie array delete and reversal');
78 ok(!exists $a[2] && !exists $a[3], 'two deleted element positions ok after tie array reversal');
79 is($a[0] . $a[1] . $a[4], '985', 'remaining elements ok after two deletes and reversals');
81 tie my @empty, "Tie::StdArray";
82 @empty = reverse @empty;
83 is(scalar(@empty), 0, 'reversed tie array still empty after reversal');
89 my $a = "\x{263A}\x{263A}x\x{263A}y\x{263A}";
90 my $b = scalar reverse($a);
91 my $c = scalar reverse($b);
92 is($a, $c, 'Unicode string double reversal matches original');
95 # in-place reversing of weak references
97 skip_if_miniperl("no dynamic loading on miniperl, no extension Scalar::Util", 2);
99 my @a = map { \(my $dummy = $_) } 1..5; # odd number of elements
100 my @r = @a[0,2]; # middle and non-middle element
101 Scalar::Util::weaken($a[0]);
102 Scalar::Util::weaken($a[2]);
105 ok defined $a[-1] && ${$a[-1]} eq '1', "in-place reverse strengthens weak reference";
106 ok defined $a[2] && ${$a[2]} eq '3', "in-place reverse strengthens weak reference in the middle";
109 # [perl #132544] stack pointer used to go wild when nullary reverse
110 # required extending the stack
111 for(0..1000){()=(0..$_,scalar reverse )}
112 pass "extending the stack without crashing";