"use strict";
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var __extends = (this && this.__extends) || (function () {
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var extendStatics = function (d, b) {
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extendStatics = Object.setPrototypeOf ||
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({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
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function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
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return extendStatics(d, b);
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}
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return function (d, b) {
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extendStatics(d, b);
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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})();
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Object.defineProperty(exports, "__esModule", { value: true });
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var Subscriber_1 = require("../Subscriber");
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function pairwise() {
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return function (source) { return source.lift(new PairwiseOperator()); };
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}
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exports.pairwise = pairwise;
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var PairwiseOperator = (function () {
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function PairwiseOperator() {
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}
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PairwiseOperator.prototype.call = function (subscriber, source) {
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return source.subscribe(new PairwiseSubscriber(subscriber));
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};
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return PairwiseOperator;
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}());
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var PairwiseSubscriber = (function (_super) {
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__extends(PairwiseSubscriber, _super);
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function PairwiseSubscriber(destination) {
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var _this = _super.call(this, destination) || this;
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_this.hasPrev = false;
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return _this;
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}
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PairwiseSubscriber.prototype._next = function (value) {
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var pair;
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if (this.hasPrev) {
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pair = [this.prev, value];
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}
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else {
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this.hasPrev = true;
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}
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this.prev = value;
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if (pair) {
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this.destination.next(pair);
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}
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};
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return PairwiseSubscriber;
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}(Subscriber_1.Subscriber));
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//# sourceMappingURL=pairwise.js.map
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