pairwise

signature: pairwise(): Observable<Array>
Emit the previous and current values as an array.
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Examples
Example 1:
( StackBlitz | jsBin | jsFiddle )
// RxJS v6+
import { pairwise, take } from 'rxjs/operators';
import { interval } from 'rxjs';
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//Returns: [0,1], [1,2], [2,3], [3,4], [4,5]
interval(1000)
  .pipe(pairwise(), take(5))
  .subscribe(console.log);
Additional Resources
​pairwise 📰 - Official docs
📁 Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/pairwise.ts​
mergeAll
race
Last updated 10 months ago