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{ Operator } from '../Operator';\nimport { Subscriber } from '../Subscriber';\nimport { tryCatch } from '../util/tryCatch';\nimport { errorObject } from '../util/errorObject';\nimport { Observable } from '../Observable';\nimport { MonoTypeOperatorFunction, TeardownLogic } from '../types';\n\n/* tslint:disable:max-line-length */\nexport function distinctUntilChanged<T>(compare?: (x: T, y: T) => boolean): MonoTypeOperatorFunction<T>;\nexport function distinctUntilChanged<T, K>(compare: (x: K, y: K) => boolean, keySelector: (x: T) => K): MonoTypeOperatorFunction<T>;\n/* tslint:enable:max-line-length */\n\n/**\n * Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from the previous item.\n *\n * If a comparator function is provided, then it will be called for each item to test for whether or not that value should be emitted.\n *\n * If a comparator function is not provided, an equality check is used by default.\n *\n * ## Example\n * A simple example with numbers\n * ```javascript\n * of(1, 1, 2, 2, 2, 1, 1, 2, 3, 3, 4).pipe(\n *     distinctUntilChanged(),\n *   )\n *   .subscribe(x => console.log(x)); // 1, 2, 1, 2, 3, 4\n * ```\n *\n * An example using a compare function\n * ```typescript\n * interface Person {\n *    age: number,\n *    name: string\n * }\n *\n * of<Person>(\n *     { age: 4, name: 'Foo'},\n *     { age: 7, name: 'Bar'},\n *     { age: 5, name: 'Foo'},\n *     { age: 6, name: 'Foo'},\n *   ).pipe(\n *     distinctUntilChanged((p: Person, q: Person) => p.name === q.name),\n *   )\n *   .subscribe(x => console.log(x));\n *\n * // displays:\n * // { age: 4, name: 'Foo' }\n * // { age: 7, name: 'Bar' }\n * // { age: 5, name: 'Foo' }\n * ```\n *\n * @see {@link distinct}\n * @see {@link distinctUntilKeyChanged}\n *\n * @param {function} [compare] Optional comparison function called to test if an item is distinct from the previous item in the source.\n * @return {Observable} An Observable that emits items from the source Observable with distinct values.\n * @method distinctUntilChanged\n * @owner Observable\n */\nexport function distinctUntilChanged<T, K>(compare?: (x: K, y: K) => boolean, keySelector?: (x: T) => K): MonoTypeOperatorFunction<T> {\n  return (source: Observable<T>) => source.lift(new DistinctUntilChangedOperator<T, K>(compare, keySelector));\n}\n\nclass DistinctUntilChangedOperator<T, K> implements Operator<T, T> {\n  constructor(private compare: (x: K, y: K) => boolean,\n              private keySelector: (x: T) => K) {\n  }\n\n  call(subscriber: Subscriber<T>, source: any): TeardownLogic {\n    return source.subscribe(new DistinctUntilChangedSubscriber(subscriber, this.compare, this.keySelector));\n  }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass DistinctUntilChangedSubscriber<T, K> extends Subscriber<T> {\n  private key: K;\n  private hasKey: boolean = false;\n\n  constructor(destination: Subscriber<T>,\n              compare: (x: K, y: K) => boolean,\n              private keySelector: (x: T) => K) {\n    super(destination);\n    if (typeof compare === 'function') {\n      this.compare = compare;\n    }\n  }\n\n  private compare(x: any, y: any): boolean {\n    return x === y;\n  }\n\n  protected _next(value: T): void {\n\n    const keySelector = this.keySelector;\n    let key: any = value;\n\n    if (keySelector) {\n      key = tryCatch(this.keySelector)(value);\n      if (key === errorObject) {\n        return this.destination.error(errorObject.e);\n      }\n    }\n\n    let result: any = false;\n\n    if (this.hasKey) {\n      result = tryCatch(this.compare)(this.key, key);\n      if (result === errorObject) {\n        return this.destination.error(errorObject.e);\n      }\n    } else {\n      this.hasKey = true;\n    }\n\n    if (Boolean(result) === false) {\n      this.key = key;\n      this.destination.next(value);\n    }\n  }\n}\n"},"lineCount":null}},"hash":"9b754b072bddbc8e75805894a88de876","cacheData":{"env":{}}}