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41 lines
1.5 KiB
41 lines
1.5 KiB
"use strict"; |
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var find_1 = require('../operators/find'); |
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/* tslint:enable:max-line-length */ |
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/** |
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* Emits only the first value emitted by the source Observable that meets some |
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* condition. |
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* |
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* <span class="informal">Finds the first value that passes some test and emits |
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* that.</span> |
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* |
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* <img src="./img/find.png" width="100%"> |
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* |
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* `find` searches for the first item in the source Observable that matches the |
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* specified condition embodied by the `predicate`, and returns the first |
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* occurrence in the source. Unlike {@link first}, the `predicate` is required |
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* in `find`, and does not emit an error if a valid value is not found. |
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* |
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* @example <caption>Find and emit the first click that happens on a DIV element</caption> |
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* var clicks = Rx.Observable.fromEvent(document, 'click'); |
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* var result = clicks.find(ev => ev.target.tagName === 'DIV'); |
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* result.subscribe(x => console.log(x)); |
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* |
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* @see {@link filter} |
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* @see {@link first} |
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* @see {@link findIndex} |
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* @see {@link take} |
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* |
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* @param {function(value: T, index: number, source: Observable<T>): boolean} predicate |
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* A function called with each item to test for condition matching. |
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* @param {any} [thisArg] An optional argument to determine the value of `this` |
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* in the `predicate` function. |
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* @return {Observable<T>} An Observable of the first item that matches the |
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* condition. |
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* @method find |
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* @owner Observable |
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*/ |
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function find(predicate, thisArg) { |
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return find_1.find(predicate, thisArg)(this); |
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} |
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exports.find = find; |
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