single
RxJS 5 single
HTML
<script src="https://npmcdn.com/@reactivex/[email protected]/dist/global/Rx.umd.js"></script>JavaScript
//emit (1,2,3,4,5)
const source = Rx.Observable.from([1,2,3,4,5]);
//emit one item that matches predicate
const example = source.single(val => val === 4);
//output: 4
const subscribe = example.subscribe(val => console.log(val));