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node_modules/rxjs/_esm5/internal/operators/pairwise.js

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+/** PURE_IMPORTS_START tslib,_Subscriber PURE_IMPORTS_END */
+import * as tslib_1 from "tslib";
+import { Subscriber } from '../Subscriber';
+export function pairwise() {
+    return function (source) { return source.lift(new PairwiseOperator()); };
+}
+var PairwiseOperator = /*@__PURE__*/ (function () {
+    function PairwiseOperator() {
+    }
+    PairwiseOperator.prototype.call = function (subscriber, source) {
+        return source.subscribe(new PairwiseSubscriber(subscriber));
+    };
+    return PairwiseOperator;
+}());
+var PairwiseSubscriber = /*@__PURE__*/ (function (_super) {
+    tslib_1.__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));
+//# sourceMappingURL=pairwise.js.map