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- {"ast":null,"code":"import { Subscriber } from '../Subscriber';\nexport function distinctUntilChanged(compare, keySelector) {\n return source => source.lift(new DistinctUntilChangedOperator(compare, keySelector));\n}\nclass DistinctUntilChangedOperator {\n constructor(compare, keySelector) {\n this.compare = compare;\n this.keySelector = keySelector;\n }\n call(subscriber, source) {\n return source.subscribe(new DistinctUntilChangedSubscriber(subscriber, this.compare, this.keySelector));\n }\n}\nclass DistinctUntilChangedSubscriber extends Subscriber {\n constructor(destination, compare, keySelector) {\n super(destination);\n this.keySelector = keySelector;\n this.hasKey = false;\n if (typeof compare === 'function') {\n this.compare = compare;\n }\n }\n compare(x, y) {\n return x === y;\n }\n _next(value) {\n let key;\n try {\n const {\n keySelector\n } = this;\n key = keySelector ? keySelector(value) : value;\n } catch (err) {\n return this.destination.error(err);\n }\n let result = false;\n if (this.hasKey) {\n try {\n const {\n compare\n } = this;\n result = compare(this.key, key);\n } catch (err) {\n return this.destination.error(err);\n }\n } else {\n this.hasKey = true;\n }\n if (!result) {\n this.key = key;\n this.destination.next(value);\n }\n }\n}\n//# sourceMappingURL=distinctUntilChanged.js.map","map":null,"metadata":{},"sourceType":"module","externalDependencies":[]}
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