interval

interval will emit sequential numbers with a given interval (first emission being delayed by that interval)

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const { rxObserver } = require('api/v0.3');
const { interval } = require('rxjs');
const { take } = require('rxjs/operators');

interval(5).pipe(
    take(10)
  )
  .subscribe(rxObserver());

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To specify an initial delay, see timer(10, 5) example