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The `uniq()` function extracts the unique set of all values within the
given input array, maintaining the original order.
Returns an array containing all unique items of the input array.
Returns `null` if the input is not an array value.
-- Testcase --
{%
let o1 = { an: "object" };
let o2 = { an: "object" }; // same but not identical
let a1 = [ 1, 2, 3 ];
let a2 = [ 1, 2, 3 ]; // same but not identical
printf("%.J\n", [
// strict comparison is used, 0 and "0" are not unique
uniq([ 0, 1, 2, 0, "0", 2, 3, "4", 4 ]),
// despite NaN != NaN, two NaN values are not unique
uniq([ NaN, NaN ]),
// only identical objects are filtered, not equivalent ones
uniq([ o1, o1, o2, a1, a1, a2 ]),
// invalid input yields `null`
uniq(true)
]);
%}
-- End --
-- Expect stdout --
[
[
0,
1,
2,
"0",
3,
"4",
4
],
[
"NaN"
],
[
{
"an": "object"
},
{
"an": "object"
},
[
1,
2,
3
],
[
1,
2,
3
]
],
null
]
-- End --
|
