Real-life: concat() checkout phases

Run the phases draft, validate, send strictly in order.

1. Solve the task in the editor — no long theory.
2. Run the check and compare your output with the expected result.
3. Stuck? Open the solution and carry the approach into your own code.

const { of, concat } = Rx;

const draft$ = of('draft');
const validate$ = of('validate');
const send$ = of('send');

const result$ = concat(draft$, validate$, send$);

result$.subscribe(value => console.log(value));