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1 | /** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */
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2 | import * as tslib_1 from "tslib";
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3 | import { Subscriber } from '../Subscriber';
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4 | export function pairwise() {
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5 | return function (source) { return source.lift(new PairwiseOperator()); };
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6 | }
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7 | var PairwiseOperator = /*@__PURE__*/ (function () {
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8 | function PairwiseOperator() {
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9 | }
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10 | PairwiseOperator.prototype.call = function (subscriber, source) {
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11 | return source.subscribe(new PairwiseSubscriber(subscriber));
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12 | };
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13 | return PairwiseOperator;
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14 | }());
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15 | var PairwiseSubscriber = /*@__PURE__*/ (function (_super) {
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16 | tslib_1.__extends(PairwiseSubscriber, _super);
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17 | function PairwiseSubscriber(destination) {
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18 | var _this = _super.call(this, destination) || this;
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19 | _this.hasPrev = false;
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20 | return _this;
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21 | }
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22 | PairwiseSubscriber.prototype._next = function (value) {
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23 | var pair;
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24 | if (this.hasPrev) {
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25 | pair = [this.prev, value];
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26 | }
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27 | else {
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28 | this.hasPrev = true;
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29 | }
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30 | this.prev = value;
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31 | if (pair) {
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32 | this.destination.next(pair);
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33 | }
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34 | };
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35 | return PairwiseSubscriber;
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36 | }(Subscriber));
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37 | //# sourceMappingURL=pairwise.js.map
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