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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../testing/asserts.ts";import { maxBy } from "./max_by.ts";
Deno.test("[collections/maxBy] of array of input", () => {  const input = [    { name: "Kyle", age: 34 },    { name: "John", age: 42 },    { name: "Anna", age: 23 },  ];
  const max = maxBy(input, (i) => i.age);
  assertEquals(max, { name: "John", age: 42 });});
Deno.test("[collections/maxBy] of array of input with mutation", () => {  const input = [    { name: "Kyle", age: 34 },    { name: "John", age: 42 },    { name: "Anna", age: 23 },  ];
  const max = maxBy(input, (i) => i.age - 10);
  assertEquals(max, { name: "John", age: 42 });});
Deno.test("[collections/maxBy] of array of input with multiple max", () => {  const input = [    { name: "Kyle", age: 34 },    { name: "John", age: 42 },    { name: "John", age: 42 },    { name: "Anna", age: 23 },  ];
  const max = maxBy(input, (i) => i.age);
  assertEquals(max, { name: "John", age: 42 });});
Deno.test("[collections/maxBy] of array of positive numbers", () => {  const input = [2, 3, 5];
  const max = maxBy(input, (i) => i);
  assertEquals(max, 5);});
Deno.test("[collections/maxBy] of array of negative numbers", () => {  const input = [-2, -3, -5];
  const max = maxBy(input, (i: number) => i);
  assertEquals(max, -2);});
Deno.test("[collections/maxBy] of array of strings", () => {  const input = ["Kyle", "John", "Anna"];
  const max = maxBy(input, (i: string) => i);
  assertEquals(max, "Kyle");});
Deno.test("[collections/maxBy] of empty array", () => {  const input: number[] = [];
  const max = maxBy(input, (i) => i);
  assertEquals(max, undefined);});
Deno.test("[collections/maxBy] of array of numbers with multiple max", () => {  const input = [2, 3, 5, 5];
  const max = maxBy(input, (i) => i);
  assertEquals(max, 5);});
Deno.test("[collections/maxBy] of array of numbers with infinity", () => {  const input = [2, 3, 5, Infinity];
  const max = maxBy(input, (i) => i);
  assertEquals(max, Infinity);});
Deno.test("[collections/maxBy] of array of numbers with NaN", () => {  const input = [2, 3, 5, NaN];
  const max = maxBy(input, (i) => i);
  assertEquals(max, 5);});
Deno.test("[collections/maxBy] no mutation", () => {  const input = [2, 3, 5];
  maxBy(input, (i) => i);
  assertEquals(input, [2, 3, 5]);});
Deno.test("[collections/maxBy] empty input", () => {  const emptyArray: Array<{ age: number }> = [];  const max = maxBy(emptyArray, (it) => it.age);
  assertEquals(max, undefined);});
Deno.test({  name: "[collections/sortBy] bigint",  fn() {    const input = [      "9007199254740999",      "9007199254740991",      "9007199254740995",    ];
    assertEquals(maxBy(input, (it) => BigInt(it)), "9007199254740999");  },});
Deno.test({  name: "[collections/sortBy] date",  fn() {    const input = [      "February 1, 2022",      "December 17, 1995",      "June 12, 2012",    ];
    assertEquals(maxBy(input, (it) => new Date(it)), "February 1, 2022");  },});