| 1 | function StringSet(items) {
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| 2 | this._items = {};
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| 3 | this._length = items ? items.length : 0;
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| 4 | if (!items) return;
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| 5 | for (let i = 0, l = items.length; i < l; i++) {
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| 6 | if (items[i] === undefined) continue;
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| 7 | this._items[items[i]] = i;
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| 8 | }
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| 9 | }
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| 10 |
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| 11 | StringSet.prototype.add = function(x) {
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| 12 | this._length = this._items[x] ? this._length : this._length + 1;
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| 13 | this._items[x] = this._items[x] ? this._items[x] : this._length;
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| 14 | return this;
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| 15 | };
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| 16 |
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| 17 | StringSet.prototype.delete = function(x) {
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| 18 | this._length = this._items[x] ? this._length - 1 : this._length;
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| 19 | delete this._items[x];
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| 20 | return this;
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| 21 | };
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| 22 |
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| 23 | StringSet.prototype.has = function(x) {
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| 24 | return this._items[x] !== undefined;
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| 25 | };
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| 26 |
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| 27 | StringSet.prototype.values = function() {
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| 28 | const orderedKeys = Object.keys(this._items).sort((a, b) => this._items[a] - this._items[b]);
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| 29 | return orderedKeys;
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| 30 | };
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| 31 |
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| 32 | StringSet.prototype.clear = function() {
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| 33 | this._length = 0;
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| 34 | this._items = {};
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| 35 | return this;
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| 36 | };
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| 37 |
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| 38 | module.exports = StringSet;
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