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
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../assert/mod.ts";import { sumOf } from "./sum_of.ts";
Deno.test("sumOf() handles object properties", () => {  const object = [    { name: "Kyle", age: 34 },    { name: "John", age: 42 },    { name: "Anna", age: 23 },  ];
  const actual = sumOf(object, (i) => i.age);
  assertEquals(actual, 99);});
Deno.test("sumOf() adds 2 to each num", () => {  const array = [1, 2, 3];
  const actual = sumOf(array, (i) => i + 2);
  assertEquals(actual, 12);});
Deno.test("sumOf() handles regular sum", () => {  const array = [1, 2, 3];
  const actual = sumOf(array, (i) => i);
  assertEquals(actual, 6);});
Deno.test("sumOf() handles negatives with regular sum", () => {  const array = [-1, -2, -3];
  const actual = sumOf(array, (i) => i);
  assertEquals(actual, -6);});
Deno.test("sumOf() handles mixed negatives and positives with regular sum", () => {  const array = [-1, 2, 3, -5];
  const actual = sumOf(array, (i) => i);
  assertEquals(actual, -1);});
Deno.test("sumOf() turns selector nums into negatives", () => {  const array = [1, 3, 5, 3];
  const actual = sumOf(array, (i) => i - 6);
  assertEquals(actual, -12);});
Deno.test("sumOf() turns selector nums into zeros", () => {  const array = [3, 3, 3, 3];
  const actual = sumOf(array, (i) => i - 3);
  assertEquals(actual, 0);});
Deno.test("sumOf() handles negative object properties", () => {  const object = [    { name: "Kyle", age: -34 },    { name: "John", age: -42 },    { name: "Anna", age: -23 },  ];
  const actual = sumOf(object, (i) => i.age);
  assertEquals(actual, -99);});
Deno.test("sumOf() handles mixed object properties", () => {  const object = [    { name: "Kyle", age: -34 },    { name: "John", age: 42 },    { name: "Anna", age: -23 },  ];
  const actual = sumOf(object, (i) => i.age);
  assertEquals(actual, -15);});
Deno.test("sumOf() handles no mutation", () => {  const array = [1, 2, 3, 4];
  sumOf(array, (i) => i + 2);
  assertEquals(array, [1, 2, 3, 4]);});
Deno.test("sumOf() handles empty array results in 0", () => {  const array: number[] = [];
  const actual = sumOf(array, (i) => i + 2);
  assertEquals(actual, 0);});
Deno.test("sumOf() handles NaN and Infinity", () => {  const array = [    1,    2,    Number.POSITIVE_INFINITY,    3,    4,    Number.NEGATIVE_INFINITY,    5,    6,    Number.NaN,    7,    8,  ];
  const actual = sumOf(array, (i) => i);
  assertEquals(actual, NaN);});
Deno.test("sumOf() handles Infinity", () => {  const array = [1, 2, Infinity, 3, 4, 5, 6, 7, 8];
  const actual = sumOf(array, (i) => i);
  assertEquals(actual, Infinity);});