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node_modules/rxjs/src/operator/pluck.ts
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EvgeniyBudaev
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17 фев 2020, 09:02
17 фев 2020, 09:02
bb6f06f
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import { Observable } from '../Observable'; import { pluck as higherOrder } from '../operators/pluck'; /** * Maps each source value (an object) to its specified nested property. * * <span class="informal">Like {@link map}, but meant only for picking one of * the nested properties of every emitted object.</span> * * <img src="./img/pluck.png" width="100%"> * * Given a list of strings describing a path to an object property, retrieves * the value of a specified nested property from all values in the source * Observable. If a property can't be resolved, it will return `undefined` for * that value. * * @example <caption>Map every click to the tagName of the clicked target element</caption> * var clicks = Rx.Observable.fromEvent(document, 'click'); * var tagNames = clicks.pluck('target', 'tagName'); * tagNames.subscribe(x => console.log(x)); * * @see {@link map} * * @param {...string} properties The nested properties to pluck from each source * value (an object). * @return {Observable} A new Observable of property values from the source values. * @method pluck * @owner Observable */ export function pluck<T, R>(this: Observable<T>, ...properties: string[]): Observable<R> { return higherOrder(...properties)(this) as Observable<R>; }