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node_modules/rxjs/_esm2015/internal/operators/scan.js

@@ -0,0 +1,58 @@
+import { Subscriber } from '../Subscriber';
+export function scan(accumulator, seed) {
+    let hasSeed = false;
+    if (arguments.length >= 2) {
+        hasSeed = true;
+    }
+    return function scanOperatorFunction(source) {
+        return source.lift(new ScanOperator(accumulator, seed, hasSeed));
+    };
+}
+class ScanOperator {
+    constructor(accumulator, seed, hasSeed = false) {
+        this.accumulator = accumulator;
+        this.seed = seed;
+        this.hasSeed = hasSeed;
+    }
+    call(subscriber, source) {
+        return source.subscribe(new ScanSubscriber(subscriber, this.accumulator, this.seed, this.hasSeed));
+    }
+}
+class ScanSubscriber extends Subscriber {
+    constructor(destination, accumulator, _seed, hasSeed) {
+        super(destination);
+        this.accumulator = accumulator;
+        this._seed = _seed;
+        this.hasSeed = hasSeed;
+        this.index = 0;
+    }
+    get seed() {
+        return this._seed;
+    }
+    set seed(value) {
+        this.hasSeed = true;
+        this._seed = value;
+    }
+    _next(value) {
+        if (!this.hasSeed) {
+            this.seed = value;
+            this.destination.next(value);
+        }
+        else {
+            return this._tryNext(value);
+        }
+    }
+    _tryNext(value) {
+        const index = this.index++;
+        let result;
+        try {
+            result = this.accumulator(this.seed, value, index);
+        }
+        catch (err) {
+            this.destination.error(err);
+        }
+        this.seed = result;
+        this.destination.next(result);
+    }
+}
+//# sourceMappingURL=scan.js.map