As I receive multiple streams from a Socket, my goal is to extract the most recent item.
While distinctUntilChanged function typically selects the first item, in this case, I need to reverse this behavior somehow.
To achieve this using rxjs, I am aiming to transform the stream as follows:
In: 1 - 1 - 1 - 2 - 2 - 3 - 3 - 1 - 1 - 1 - 2 - 2 - 2 - 1 - 2 - 2 - 3 - 3
Out: - - - - 1 - - - 2 - - - 3 - - - - - 1 - - - - - 2 - 1 - - - 2 - 3 - -
We can output the previous value when it changes:
In: 1 - 1 - 1 - 2 - 2 - 3 - 3 - 1 - 1 - 1 - 2 - 2 - 2 - 1 - 2 - 2 - 3 - 3
Out: - - - - - - 1 - - - 2 - - - 3 - - - - - 1 - - - - - 2 - 1 - - - 2 - 3
import { pairwise, take, filter, map, merge, last } from 'rxjs/operators';
import { interval, from } from 'rxjs';
const values$ = from([1, 1, 1, 2, 2, 3, 3, 1, 1, 1, 2, 2, 2, 1, 2, 2, 3, 3]);
values$
.pipe(
pairwise(),
filter(([prev, cur]) => prev !== cur),
map(([prev, cur]) => prev),
merge(values$.pipe(last()))
)
.subscribe(console.log);
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