Javascript-Algorithms-DataStructures/src/utils/comparator/comparator.js at master · singla-shivam/Javascript-Algorithms-DataStructures · 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
/**
 * @class Comparator class for comparing two values
 * @template T
 */
class Comparator {

  constructor(compareFunc) {
    this.compareFunc = compareFunc || Comparator.defaultCompareFunction
  }

  /**
   * Default Comparision function which compares two numbers or strings
   * @param a {T}
   * @param b {T}
   * @returns {number}
   */
  static  defaultCompareFunction(a, b) {
    if(a === b) return 0
    return a > b ? 1 : -1
  }

  /**
   * Checks if "a" is equal to "b"
   * @param a {T}
   * @param b {T}
   * @returns {boolean}
   */
  equal(a, b) {
    return this.compareFunc(a, b) === 0
  }

  /**
   * Checks if "a" is less than "b"
   * @param a {T}
   * @param b {T}
   * @returns {boolean}
   */
  lessThan(a, b) {
    return this.compareFunc(a, b) < 0
  }

  /**
   * Checks if "a" is more than "b"
   * @param a {T}
   * @param b {T}
   * @returns {boolean}
   */
  moreThan(a, b) {
    return this.compareFunc(a, b) > 0
  }

  /**
   * Checks if "a" is less than or equal to "b"
   * @param a {T}
   * @param b {T}
   * @returns {boolean}
   */
  lessThanOrEqual(a, b) {
    return this.lessThan(a, b) || this.equal(a, b)
  }

  /**
   * Checks if "a" is more than or equal to "b"
   * @param a {T}
   * @param b {T}
   * @returns {boolean}
   */
  moreThanOrEqual(a, b) {
    return this.moreThan(a, b) || this.equal(a, b)
  }

}

module.exports = Comparator