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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../testing/asserts.ts";import { filterKeys } from "./filter_keys.ts";
function filterKeysTest<T>(  input: [Record<string, T>, (key: string) => boolean],  expected: Record<string, T>,  message?: string,) {  const actual = filterKeys(...input);  assertEquals(actual, expected, message);}
Deno.test({  name: "[collections/filterKeys] no mutation",  fn() {    const object = { a: 5, b: true };    filterKeys(object, (key) => key !== "a");
    assertEquals(object, { a: 5, b: true });  },});
Deno.test({  name: "[collections/filterKeys] empty input",  fn() {    filterKeysTest(      [{}, () => true],      {},    );  },});
Deno.test({  name: "[collections/filterKeys] identity",  fn() {    filterKeysTest(      [        {          foo: true,          bar: "lorem",          1: -5,        },        () => true,      ],      {        foo: true,        bar: "lorem",        1: -5,      },    );  },});
Deno.test({  name: "[collections/filterKeys] filters",  fn() {    filterKeysTest(      [        {          foo: true,          bar: "lorem",          baz: 13,          1: -5,        },        (it) => it.startsWith("b"),      ],      {        bar: "lorem",        baz: 13,      },    );    filterKeysTest(      [        {          "Kim": 22,          "Andrew": 14,          "Marija": 34,        },        (it) => it.length > 3,      ],      {        "Andrew": 14,        "Marija": 34,      },    );  },});