4 examples of 'mapiterator' in JavaScript

32
var MapIterator = function MapIterator(map, kind) {
33
    var _index = 0;
34
35
    return Object.create({}, {
36
        next: {
37
            value: function() {
38
                // check if index is within bounds
39
                if (_index < map.items().length) {
40
                    switch(kind) {
41
                        case 'keys': return map.keys()[_index++];
42
                        case 'values': return map.values()[_index++];
43
                        case 'keys+values': return [].slice.call(map.items()[_index++]);
44
                        default: throw new TypeError('Invalid iterator type');
45
                    }
46
                }
47
                // TODO: make sure I'm interpreting the spec correctly here
48
                throw new Error('Stop Iteration');
49
            }
50
        },
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        iterator: {
52
            value: function() {
53
                return this;
54
            }
55
        },
56
        toString: {
57
            value: function() {
58
                return '[object Map Iterator]';
59
            }
60
        }
61
    });
62
};

1074
public iterator():JIterator<K> { return new NavigableHashMapKeySetJIterator(this.impl); }

44
function MapIterator(keys, valueGetter) {
45
    this._keys = keys;
46
    this._valueGetter = valueGetter;
47
    this._length = this._keys.length;
48
    this._index = -1;
49
    this._done = false;
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}

38
public reverse(): MapReverseIterator<Key, T, Source>
39
{
40
	return new MapReverseIterator(this);
41
}