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data-ice="title">es6/observable/FromObservable.js</h1> <pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import { isArray } from '../util/isArray'; import { isPromise } from '../util/isPromise'; import { PromiseObservable } from './PromiseObservable'; import { IteratorObservable } from './IteratorObservable'; import { ArrayObservable } from './ArrayObservable'; import { ArrayLikeObservable } from './ArrayLikeObservable'; import { $$iterator } from '../symbol/iterator'; import { Observable } from '../Observable'; import { ObserveOnSubscriber } from '../operator/observeOn'; import { $$observable } from '../symbol/observable'; var isArrayLike = (function (x) { return x && typeof x.length === 'number'; }); /** * We need this JSDoc comment for affecting ESDoc. * @extends {Ignored} * @hide true */ export var FromObservable = (function (_super) { __extends(FromObservable, _super); function FromObservable(ish, scheduler) { _super.call(this, null); this.ish = ish; this.scheduler = scheduler; } /** * Creates an Observable from an Array, an array-like object, a Promise, an * iterable object, or an Observable-like object. * * <span class="informal">Converts almost anything to an Observable.</span> * * <img src="./img/from.png" width="100%"> * * Convert various other objects and data types into Observables. `from` * converts a Promise or an array-like or an * [iterable](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#iterable) * object into an Observable that emits the items in that promise or array or * iterable. A String, in this context, is treated as an array of characters. * Observable-like objects (contains a function named with the ES2015 Symbol * for Observable) can also be converted through this operator. * * @example <caption>Converts an array to an Observable</caption> * var array = [10, 20, 30]; * var result = Rx.Observable.from(array); * result.subscribe(x => console.log(x)); * * @example <caption>Convert an infinite iterable (from a generator) to an Observable</caption> * function* generateDoubles(seed) { * var i = seed; * while (true) { * yield i; * i = 2 * i; // double it * } * } * * var iterator = generateDoubles(3); * var result = Rx.Observable.from(iterator).take(10); * result.subscribe(x => console.log(x)); * * @see {@link create} * @see {@link fromEvent} * @see {@link fromEventPattern} * @see {@link fromPromise} * * @param {ObservableInput<T>} ish A subscribable object, a Promise, an * Observable-like, an Array, an iterable or an array-like object to be * converted. * @param {Scheduler} [scheduler] The scheduler on which to schedule the * emissions of values. * @return {Observable<T>} The Observable whose values are originally from the * input object that was converted. * @static true * @name from * @owner Observable */ FromObservable.create = function (ish, scheduler) { if (ish != null) { if (typeof ish[$$observable] === 'function') { if (ish instanceof Observable && !scheduler) { return ish; } return new FromObservable(ish, scheduler); } else if (isArray(ish)) { return new ArrayObservable(ish, scheduler); } else if (isPromise(ish)) { return new PromiseObservable(ish, scheduler); } else if (typeof ish[$$iterator] === 'function' || typeof ish === 'string') { return new IteratorObservable(ish, scheduler); } else if (isArrayLike(ish)) { return new ArrayLikeObservable(ish, scheduler); } } throw new TypeError((ish !== null && typeof ish || ish) + ' is not observable'); }; FromObservable.prototype._subscribe = function (subscriber) { var ish = this.ish; var scheduler = this.scheduler; if (scheduler == null) { return ish[$$observable]().subscribe(subscriber); } else { return ish[$$observable]().subscribe(new ObserveOnSubscriber(subscriber, scheduler, 0)); } }; return FromObservable; }(Observable)); //# sourceMappingURL=FromObservable.js.map</code></pre> </div> <footer class="footer"> Generated by <a href="https://esdoc.org">ESDoc<span data-ice="esdocVersion">(0.4.8)</span></a> </footer> <script src="script/search_index.js"></script> <script src="script/search.js"></script> <script src="script/pretty-print.js"></script> <script src="script/inherited-summary.js"></script> <script src="script/test-summary.js"></script> <script src="script/inner-link.js"></script> <script src="script/patch-for-local.js"></script> </body> </html>