git ssb

1
var MutantLookup = require('./lookup')
2
var MutantDict = require('./dict')
3
var DictToCollection = require('./dict-to-collection')
4
5
module.exports = MutantMappedDict
6
7
function MutantMappedDict (defaultItems, lambda, opts) {
8
  opts = opts || {}
9
10
  var list = MutantDict(defaultItems, {
11
    comparer: opts.comparer
12
  })
13
14
  var observable = MutantLookup(DictToCollection(list), function (item, invalidateOn) {
15
    var value = lambda(item.key, item.value, invalidateOn)
16
    if (value[0] === item.key && value[1] === item.value) {
17
      return item // passthru
18
    } else {
19
      return value
20
    }
21
  }, opts)
22
23
  observable.set = list.set
24
25
  observable.put = function (key, item) {
26
    list.put(key, item)
27
    return observable.get(key)
28
  }
29
30
  observable.delete = function (key) {
31
    list.delete(key)
32
  }
33
34
  return observable
35
}
36