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