1 The `rindex()` function locates an element within a given array or a substring 2 position within a given string, depending on the type of arguments given. 3 4 Returns `null` if the given haystack argument is neither an array nor a string, 5 returns `-1` if the element was not found within the array or the substring was 6 not found within the string. 7 8 Returns the last found index position in all other cases. 9 10 -- Testcase -- 11 {% 12 let o = {}; 13 14 printf("%.J\n", [ 15 rindex([ 1, 2, "abc", 3, "abc", 1, 2 ], "abc"), // should return 4 16 rindex([ 1, 2, 3 ], 4), // should return -1 17 rindex([ [], {} ], {}), // should return -1 (strict equality) 18 rindex([ [], o ], o), // should return 1 (strict equality) 19 20 rindex("foobarfoobarfoobar", "arf"), // should return 10 21 rindex("test", "hello"), // should return -1 22 rindex("test", "test"), // should return 0 (needle = haystack length special case) 23 rindex("test", ""), // should return 4 (zero length needle special case) 24 rindex("", ""), // should return 0 (zero length special case) 25 rindex("foo\0foo\0foo", "o\0f"), // should return 6 (binary safe) 26 27 rindex({ test: true }, true), // should return null 28 rindex(1234, 3), // should return null 29 ]); 30 %} 31 -- End -- 32 33 -- Expect stdout -- 34 [ 35 4, 36 -1, 37 -1, 38 1, 39 10, 40 -1, 41 0, 42 4, 43 0, 44 6, 45 null, 46 null 47 ] 48 -- End --
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