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The `index()` function locates an element within a given array or a substring
position within a given string, depending on the type of arguments given.
Returns `null` if the given haystack argument is neither an array nor a string,
returns `-1` if the element was not found within the array or the substring was
not found within the string.
Returns the first found index position in all other cases.
-- Testcase --
{%
let o = {};
printf("%.J\n", [
index([ 1, 2, "abc", 3, "abc", 1, 2 ], "abc"), // should return 2
index([ 1, 2, 3 ], 4), // should return -1
index([ [], {} ], {}), // should return -1 (strict equality)
index([ [], o ], o), // should return 1 (strict equality)
index("foobarfoobarfoobar", "arf"), // should return 4
index("test", "hello"), // should return -1
index("test", "test"), // should return 0 (needle = haystack length special case)
index("test", ""), // should return 0 (zero length needle special case)
index("", ""), // should return 0 (zero length special case)
index("foo\0foo\0foo", "o\0f"), // should return 2 (binary safe)
index({ test: true }, true), // should return null
index(1234, 3), // should return null
]);
%}
-- End --
-- Expect stdout --
[
2,
-1,
-1,
1,
4,
-1,
0,
0,
0,
2,
null,
null
]
-- End --
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