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