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A String, in this context, is treated as an array of characters.\n * Observable-like objects (contains a function named with the ES2015 Symbol\n * for Observable) can also be converted through this operator.\n *\n * @example <caption>Converts an array to an Observable</caption>\n * var array = [10, 20, 30];\n * var result = Rx.Observable.from(array);\n * result.subscribe(x => console.log(x));\n *\n * // Results in the following:\n * // 10 20 30\n *\n * @example <caption>Convert an infinite iterable (from a generator) to an Observable</caption>\n * function* generateDoubles(seed) {\n * var i = seed;\n * while (true) {\n * yield i;\n * i = 2 * i; // double it\n * }\n * }\n *\n * var iterator = generateDoubles(3);\n * var result = Rx.Observable.from(iterator).take(10);\n * result.subscribe(x => console.log(x));\n *\n * // Results in the following:\n * // 3 6 12 24 48 96 192 384 768 1536\n *\n * @see {@link create}\n * @see {@link fromEvent}\n * @see {@link fromEventPattern}\n * @see {@link fromPromise}\n *\n * @param {ObservableInput<T>} ish A subscribable object, a Promise, an\n * Observable-like, an Array, an iterable or an array-like object to be\n * converted.\n * @param {Scheduler} [scheduler] The scheduler on which to schedule the\n * emissions of values.\n * @return {Observable<T>} The Observable whose values are originally from the\n * input object that was converted.\n * @static true\n * @name from\n * @owner Observable\n */\n static create<T>(ish: ObservableInput<T>, scheduler?: IScheduler): Observable<T> {\n if (ish != null) {\n if (typeof ish[Symbol_observable] === 'function') {\n if (ish instanceof Observable && !scheduler) {\n return ish;\n }\n return new FromObservable<T>(ish, scheduler);\n } else if (isArray(ish)) {\n return new ArrayObservable<T>(ish, scheduler);\n } else if (isPromise<T>(ish)) {\n return new PromiseObservable<T>(ish, scheduler);\n } else if (typeof ish[Symbol_iterator] === 'function' || typeof ish === 'string') {\n return new IteratorObservable<T>(ish, scheduler);\n } else if (isArrayLike(ish)) {\n return new ArrayLikeObservable(ish, scheduler);\n }\n }\n\n throw new TypeError((ish !== null && typeof ish || ish) + ' is not observable');\n }\n\n /** @deprecated internal use only */ _subscribe(subscriber: Subscriber<T>) {\n const ish = this.ish;\n const scheduler = this.scheduler;\n if (scheduler == null) {\n return ish[Symbol_observable]().subscribe(subscriber);\n } else {\n return ish[Symbol_observable]().subscribe(new ObserveOnSubscriber(subscriber, scheduler, 0));\n }\n }\n}\n"]} |