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class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import { FindValueOperator } from './find'; /** * Emits only the index of the first value emitted by the source Observable that * meets some condition. * * <span class="informal">It's like {@link find}, but emits the index of the * found value, not the value itself.</span> * * <img src="./img/findIndex.png" width="100%"> * * `findIndex` searches for the first item in the source Observable that matches * the specified condition embodied by the `predicate`, and returns the * (zero-based) index of the first occurrence in the source. Unlike * {@link first}, the `predicate` is required in `findIndex`, and does not emit * an error if a valid value is not found. * * @example <caption>Emit the index of first click that happens on a DIV element</caption> * var clicks = Rx.Observable.fromEvent(document, 'click'); * var result = clicks.findIndex(ev => ev.target.tagName === 'DIV'); * result.subscribe(x => console.log(x)); * * @see {@link filter} * @see {@link find} * @see {@link first} * @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} An Observable of the index of the first item that * matches the condition. * @method find * @owner Observable */ export function findIndex(predicate, thisArg) { return this.lift(new FindValueOperator(predicate, this, true, thisArg)); } //# sourceMappingURL=findIndex.js.map</code></pre> </div> <footer class="footer"> Generated by <a href="https://esdoc.org">ESDoc<span data-ice="esdocVersion">(0.4.8)</span></a> </footer> <script src="script/search_index.js"></script> <script src="script/search.js"></script> <script src="script/pretty-print.js"></script> <script src="script/inherited-summary.js"></script> <script src="script/test-summary.js"></script> <script src="script/inner-link.js"></script> <script src="script/patch-for-local.js"></script> </body> </html>