Code coverage report for nodash/lib/Either.js

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
 
 
 
1
 
 
5
 
5
 
1
10
 
 
1
29
14
 
15
 
5
 
1
29
14
 
15
 
5
 
5
 
5
 
 
 
 
 
 
 
 
 
 
 
 
5
2
3
2
 
1
 
 
 
 
2
1
 
1
 
 
 
2
1
 
1
 
 
 
6
 
 
 
6
 
 
 
1
 
 
 
 
 
/* vim: set et sw=2 ts=2: */
'use strict';
 
module.exports = [ 'idf', 'is', 'map', 'compose', 'filter',
  function (idf, is, map, compose, filter) {
 
  var Nodash = this;
 
  var fail = function() {};
 
  function Either() {
    fail();
  }
 
  function Left(value) {
    if (!(this instanceof Left)) {
      return new Left(value);
    }
    this.value = idf(value);
  }
  Left.prototype = new Either();
 
  function Right(value) {
    if (!(this instanceof Right)) {
      return new Right(value);
    }
    this.value = idf(value);
  }
  Right.prototype = new Either();
 
  fail = function() { throw new Error(); };
 
  return {
 
    Either: Either,
 
    Left: Left,
 
    Right: Right,
 
    isLeft: is(Left),
 
    isRight: is(Right),
 
    either: function (afun, bfun, value) {
      if (is(Left, value)) {
        return afun(value.value());
      } else if (is(Right, value)) {
        return bfun(value.value());
      } else {
        fail();
      }
    },
 
    fromLeft: function (thing) {
      if (is(Left, thing)) {
        return thing.value();
      }
      fail();
    },
 
    fromRight: function (thing) {
      if (is(Right, thing)) {
        return thing.value();
      }
      fail();
    },
 
    lefts: compose(map(function (x) {
      return x.value();
    }), filter(is(Left))),
 
    rights: compose(map(function (x) {
      return x.value();
    }), filter(is(Right))),
 
    partitionEithers: function (xs) {
      return Nodash.tuple(Nodash.lefts(xs), Nodash.rights(xs));
    }
    
  };
}];