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