forked from ramda/ramda
/
Pair.js
45 lines (42 loc) · 1.46 KB
/
Pair.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
var R = require('../../source');
function Pair(left, right) {
return {
'@@type': 'ramda/Pair',
'fantasy-land/equals': function equals(pair) {
return pair != null
&& pair['@@type'] === this['@@type']
&& R.equals(left, pair.left)
&& R.equals(right, pair.right);
},
'fantasy-land/concat': function concat(pair) {
return Pair(R.concat(left, pair.left), R.concat(right, pair.right));
},
'fantasy-land/map': function map(f) { return Pair(left, f(right)); },
'fantasy-land/ap': function ap(pair) {
return Pair(R.concat(left, pair.left), right(pair.right));
},
'fantasy-land/reduce': function reduce(f, x) { return f(x, right); },
'fantasy-land/traverse': function traverse(of, f) {
return R.map(
function(x) { return Pair(left, x); },
of(f(right))
);
},
'fantasy-land/chain': function chain(f) {
var pair = f(right);
return Pair(R.concat(left, pair.left), pair.right);
},
'fantasy-land/bimap': function bimap(f, g) { return Pair(f(left), g(right)); },
'fantasy-land/promap': function promap(f, g) {
return Pair(R.promap(f, g, left), R.promap(f, g, right));
},
merge: function merge(f) { return f(left, right); },
toString: function toString() {
return `Pair(${R.toString(left)}, ${R.toString(right)})`;
},
toArray: function toArray() { return [left, right]; },
left: left,
right: right
};
}
module.exports = Pair;