git ssb

1
var MutantMap = require('./map')
2
var MutantArray = require('./array')
3
4
module.exports = MutantMappedArray
5
6
function MutantMappedArray (defaultItems, lambda, opts) {
7
  opts = opts || {}
8
9
  var list = MutantArray(defaultItems, {
10
    comparer: opts.comparer,
11
    fixedIndexing: true
12
  })
13
14
  var obs = MutantMap(list, lambda, opts)
15
  obs.set = list.set
16
17
  obs.push = function (item) {
18
    list.push(item)
19
    return obs.get(obs.getLength() - 1)
20
  }
21
22
  obs.insert = function (item, at) {
23
    list.insert(item, at)
24
    return obs.get(at)
25
  }
26
27
  obs.remove = function (mappedItem) {
28
    var index = obs.indexOf(mappedItem)
29
    if (~index) {
30
      list.deleteAt(index)
31
      return true
32
    }
33
  }
34
35
  obs.move = function (mappedItem, targetIndex) {
36
    var currentIndex = obs.indexOf(mappedItem)
37
    if (~currentIndex) {
38
      var item = list.get(currentIndex)
39
      if (currentIndex < targetIndex) {
40
        list.transaction(function () {
41
          list.insert(item, targetIndex + 1)
42
          list.deleteAt(currentIndex)
43
        })
44
      } else if (currentIndex > targetIndex) {
45
        list.transaction(function () {
46
          list.insert(item, targetIndex)
47
          list.deleteAt(currentIndex + 1)
48
        })
49
      }
50
    }
51
  }
52
53
  return obs
54
}
55