import {Observable} from '../Observable';
import {FindValueOperator} from './find';
/**
* Returns an Observable that searches for the first item in the source Observable that
* matches the specified condition, and returns the the index of the item in the source.
* @param {function} predicate function called with each item to test for condition matching.
* @returns {Observable} an Observable of the index of the first item that matches the condition.
*/
export function findIndex<T>(predicate: (value: T, index: number, source: Observable<T>) => boolean, thisArg?: any): Observable<number> {
return this.lift(new FindValueOperator(predicate, this, true, thisArg));
}
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