first
RxJS 5 first
HTML
<script src="https://npmcdn.com/@reactivex/[email protected]/dist/global/Rx.umd.js"></script>JavaScript
const source = Rx.Observable.from([1,2,3,4,5]);
//no arguments, emit first value
const example = source.first();
//output: "First value: 1"
const subscribe = example.subscribe(val => console.log(`First value: ${val}`));