javascript-basics/src/booleans.js at b65bdd196e51655bb53f75d20c896a3df9fb3437 · CommandShiftHQ/javascript-basics · GitHub

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
const negate = a => {
  return !a;
};

const both = (a, b) => {
  return a && b;
};

const either = (a, b) => {
  return a || b;
};

const none = (a, b) => {
  return !a && !b;
};

const one = (a, b) => {
  return (a || b) && !(a && b);
};

const truthiness = a => {
  return Boolean (a);
};

const isEqual = (a, b) => {
  return a === b;
};

const isGreaterThan = (a, b) => {
  return a > b;
};

const isLessThanOrEqualTo = (a, b) => {
  return a <= b;
};

const isOdd = a => {
  return (a % 2) === 1;
};

const isEven = a => {
  return (a % 2) === 2;
};

const isSquare = a => {
  return Boolean(Math.sqrt(a) % 1 === 0);
};

const startsWith = (char, string) => {
  return string.CharAt (0) === char;
};

const containsVowels = string => {
  return string
};

const isLowerCase = string => {
  return string === string.toLowerCase();
};

module.exports = {
  negate,
  both,
  either,
  none,
  one,
  truthiness,
  isEqual,
  isGreaterThan,
  isLessThanOrEqualTo,
  isOdd,
  isEven,
  isSquare,
  startsWith,
  containsVowels,
  isLowerCase
};