pairwise

signature: pairwise(): Observable<Array>

Emit the previous and current values as an array.

Examples

Example 1:

( StackBlitz | jsBin | jsFiddle )

import { pairwise, take } from 'rxjs/operators';
import { interval } from 'rxjs/observable/interval';

//Returns: [0,1], [1,2], [2,3], [3,4], [4,5]
interval(1000)
  .pipe(pairwise(), take(5))
  .subscribe(console.log);

Additional Resources


:file_folder: Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/pairwise.ts

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