1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../assert/mod.ts";import { distinct } from "./distinct.ts";
function distinctTest<I>(  input: Array<I>,  expected: Array<I>,  message?: string,) {  const actual = distinct(input);  assertEquals(actual, expected, message);}
Deno.test({  name: "distinct() handles identities on empty array",  fn() {    distinctTest([], []);  },});
Deno.test({  name: "distinct() removes duplicates and preserves order",  fn() {    distinctTest(      [true, "asdf", 4, "asdf", true],      [true, "asdf", 4],    );    distinctTest(      [null, undefined, null, "foo", undefined],      [null, undefined, "foo"],    );    distinctTest(      [true, "asdf", 4, "asdf", true],      [true, "asdf", 4],    );  },});
Deno.test({  name: "distinct() does not check for deep equality",  fn() {    const objects = [{ foo: "bar" }, { foo: "bar" }];    distinctTest(objects, objects);
    const arrays = [[], []];    distinctTest(arrays, arrays);
    const nans = [NaN, NaN];    distinctTest(nans, [nans[0]]);
    const noops = [() => {}, () => {}];    distinctTest(noops, noops);
    const sets = [new Set(), new Set()];    distinctTest(sets, sets);  },});