//take the first observable to emit
const example = Rx.Observable.race(
//emit every 1.5s
Rx.Observable.interval(1500),
//emit every 1s
Rx.Observable.interval(1000).mapTo('1s won!'),
//emit every 2s
Rx.Observable.interval(2000),
//emit every 2.5s
Rx.Observable.interval(2500)
);
//output: "1s won!"..."1s won!"...etc
const subscribe = example.subscribe(val => console.log(val));
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