@ngneat/loadoff
Version:
<p align="center"> <img width="20%" height="20%" src="./logo.svg"> </p>
14 lines • 2.58 kB
JavaScript
import { pipe } from 'rxjs';
import { scan, startWith } from 'rxjs/operators';
import { AsyncState, createAsyncState } from './toAsyncState';
/**
* Operator that retains the previous response on a new emission of an AsyncState item.
* This can be useful for implementing a refresh mechanism, where you want to keep displaying the old value while fetching a new value
*/
export function retainResponse(startWithValue = createAsyncState()) {
return pipe(startWith(startWithValue), scan((acc, val) => new AsyncState({
...val,
res: val.success ? val.res : acc.res,
})));
}
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