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9.8 KiB
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9.8 KiB
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Executable File
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Or emits only the first\n * value that passes some test.</span>\n *\n * <img src=\"./img/first.png\" width=\"100%\">\n *\n * If called with no arguments, `first` emits the first value of the source\n * Observable, then completes. If called with a `predicate` function, `first`\n * emits the first value of the source that matches the specified condition. It\n * may also take a `resultSelector` function to produce the output value from\n * the input value, and a `defaultValue` to emit in case the source completes\n * before it is able to emit a valid value. Throws an error if `defaultValue`\n * was not provided and a matching element is not found.\n *\n * @example <caption>Emit only the first click that happens on the DOM</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var result = clicks.first();\n * result.subscribe(x => console.log(x));\n *\n * @example <caption>Emits the first click that happens on a DIV</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var result = clicks.first(ev => ev.target.tagName === 'DIV');\n * result.subscribe(x => console.log(x));\n *\n * @see {@link filter}\n * @see {@link find}\n * @see {@link take}\n *\n * @throws {EmptyError} Delivers an EmptyError to the Observer's `error`\n * callback if the Observable completes before any `next` notification was sent.\n *\n * @param {function(value: T, index: number, source: Observable<T>): boolean} [predicate]\n * An optional function called with each item to test for condition matching.\n * @param {function(value: T, index: number): R} [resultSelector] A function to\n * produce the value on the output Observable based on the values\n * and the indices of the source Observable. The arguments passed to this\n * function are:\n * - `value`: the value that was emitted on the source.\n * - `index`: the \"index\" of the value from the source.\n * @param {R} [defaultValue] The default value emitted in case no valid value\n * was found on the source.\n * @return {Observable<T|R>} An Observable of the first item that matches the\n * condition.\n * @method first\n * @owner Observable\n */\nexport function first<T, R>(predicate?: (value: T, index: number, source: Observable<T>) => boolean,\n resultSelector?: ((value: T, index: number) => R) | void,\n defaultValue?: R): OperatorFunction<T, T | R> {\n return (source: Observable<T>) => source.lift(new FirstOperator(predicate, resultSelector, defaultValue, source));\n}\n\nclass FirstOperator<T, R> implements Operator<T, R> {\n constructor(private predicate?: (value: T, index: number, source: Observable<T>) => boolean,\n private resultSelector?: ((value: T, index: number) => R) | void,\n private defaultValue?: any,\n private source?: Observable<T>) {\n }\n\n call(observer: Subscriber<R>, source: any): any {\n return source.subscribe(new FirstSubscriber(observer, this.predicate, this.resultSelector, this.defaultValue, this.source));\n }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass FirstSubscriber<T, R> extends Subscriber<T> {\n private index: number = 0;\n private hasCompleted: boolean = false;\n private _emitted: boolean = false;\n\n constructor(destination: Subscriber<R>,\n private predicate?: (value: T, index: number, source: Observable<T>) => boolean,\n private resultSelector?: ((value: T, index: number) => R) | void,\n private defaultValue?: any,\n private source?: Observable<T>) {\n super(destination);\n }\n\n protected _next(value: T): void {\n const index = this.index++;\n if (this.predicate) {\n this._tryPredicate(value, index);\n } else {\n this._emit(value, index);\n }\n }\n\n private _tryPredicate(value: T, index: number) {\n let result: any;\n try {\n result = this.predicate(value, index, this.source);\n } catch (err) {\n this.destination.error(err);\n return;\n }\n if (result) {\n this._emit(value, index);\n }\n }\n\n private _emit(value: any, index: number) {\n if (this.resultSelector) {\n this._tryResultSelector(value, index);\n return;\n }\n this._emitFinal(value);\n }\n\n private _tryResultSelector(value: T, index: number) {\n let result: any;\n try {\n result = (<any>this).resultSelector(value, index);\n } catch (err) {\n this.destination.error(err);\n return;\n }\n this._emitFinal(result);\n }\n\n private _emitFinal(value: any) {\n const destination = this.destination;\n if (!this._emitted) {\n this._emitted = true;\n destination.next(value);\n destination.complete();\n this.hasCompleted = true;\n }\n }\n\n protected _complete(): void {\n const destination = this.destination;\n if (!this.hasCompleted && typeof this.defaultValue !== 'undefined') {\n destination.next(this.defaultValue);\n destination.complete();\n } else if (!this.hasCompleted) {\n destination.error(new EmptyError);\n }\n }\n}\n"]} |