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The `reverse()` function returns the input argument in reverse order.
Returns a reversed copy of the input string if the given input value
argument is a string.
Returns a reversed copy of the input array if the given input value
argument is an array.
Returns `null` if the input argument is neither a string nor an array.
-- Testcase --
{%
printf("%.J\n", [
reverse("abc"),
reverse([1, 2, 3]),
reverse(true)
]);
%}
-- End --
-- Expect stdout --
[
"cba",
[
3,
2,
1
],
null
]
-- End --
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