rxjs-utils-operators

name	rxjs-utils-operators
description	RxJS operators from @ibenvandeveire/rxjs-utils: populate, pluck, pluckOr, fetchIf, combineBooleans. Use when enriching streams or conditional fetches.

rxjs-utils — Operators

populate

Fills missing keys on emitted objects from a record of observables (optional matcher per key).

of({ hello: 'world' }).pipe(
  populate({
    world: () => of('hello'),
    'foo.bar': (data) => of(data.hello),
  }),
);
// → { hello: 'world', world: 'hello', foo: { bar: 'world' } }

pluckOr

Emit first defined property among keys: pluckOr('name', 'firstName').

pluck

Emit single property: pluck('name').

fetchIf

If search(sourceValue) returns a value, emit it; else run fetch and emit result. Common for “load from API if not in state”.

fetchIf(
  of([{ id: 'hello' }]),
  (data) => data.find((item) => item.id === 'world'),
  () => of({ id: 'world' }),
);

combineBooleans

AND-combines Observable<boolean>[] → single Observable<boolean>.