-
Notifications
You must be signed in to change notification settings - Fork 0
/
evented-map.js
73 lines (59 loc) · 1.7 KB
/
evented-map.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
define(function(require) {
'use strict';
var delegate = require('./utils').delegate;
var Emitter = require('./emitter');
var Map = require('./map');
function emitRemove(key) {
// this is a private method so it can use 'this'
//jshint validthis:true
this.emitter.emit('remove', key);
}
/**
* A collection to store items by key value. Only strings are allowed.
* It implements emitter so you can listen to changes
*/
return {
new: function(start) {
return Object.create(this).init(start);
},
init: function(start) {
this.map = Map.new();
this.emitter = Emitter.new();
if (start) {
Object.keys(start).forEach(function(key) {
this.set(key, start[key]);
}, this);
}
return this;
},
has: delegate('map', 'has'),
get: delegate('map', 'get'),
set: function(key, value) {
var isNew = this.map.set(key, value);
this.emitter.emit('change', this.map);
if (isNew)
this.emitter.emit('add', key);
},
remove: function(key) {
if (this.map.remove(key)) {
this.emitter.emit('change', this.map);
this.emitter.emit('remove', key);
}
},
clear: function() {
var removed = Object.keys(this.map.clear());
if (removed.length) {
this.emitter.emit('change', this.map);
removed.forEach(emitRemove, this);
}
},
keys: delegate('map', 'keys'),
values: delegate('map', 'values'),
forEach: delegate('map', 'forEach'),
some: delegate('map', 'some'),
every: delegate('map', 'every'),
map: delegate('map', 'map'),
filter: delegate('map', 'filter'),
reduce: delegate('map', 'reduce'),
};
});