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- {"ast":null,"code":"import { Subscriber } from '../Subscriber';\nexport function scan(accumulator, seed) {\n let hasSeed = false;\n if (arguments.length >= 2) {\n hasSeed = true;\n }\n return function scanOperatorFunction(source) {\n return source.lift(new ScanOperator(accumulator, seed, hasSeed));\n };\n}\nclass ScanOperator {\n constructor(accumulator, seed, hasSeed = false) {\n this.accumulator = accumulator;\n this.seed = seed;\n this.hasSeed = hasSeed;\n }\n call(subscriber, source) {\n return source.subscribe(new ScanSubscriber(subscriber, this.accumulator, this.seed, this.hasSeed));\n }\n}\nclass ScanSubscriber extends Subscriber {\n constructor(destination, accumulator, _seed, hasSeed) {\n super(destination);\n this.accumulator = accumulator;\n this._seed = _seed;\n this.hasSeed = hasSeed;\n this.index = 0;\n }\n get seed() {\n return this._seed;\n }\n set seed(value) {\n this.hasSeed = true;\n this._seed = value;\n }\n _next(value) {\n if (!this.hasSeed) {\n this.seed = value;\n this.destination.next(value);\n } else {\n return this._tryNext(value);\n }\n }\n _tryNext(value) {\n const index = this.index++;\n let result;\n try {\n result = this.accumulator(this.seed, value, index);\n } catch (err) {\n this.destination.error(err);\n }\n this.seed = result;\n this.destination.next(result);\n }\n}\n//# sourceMappingURL=scan.js.map","map":null,"metadata":{},"sourceType":"module","externalDependencies":[]}
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