Different between of(...) and [...] in switchMap in effect

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For example we have some effect:

...
switchMap(() => of(action1, action2))
...

and

...
switchMap(() => [action1, action2])
...

Do we have any differents?

1

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MoxxiManagarm On BEST ANSWER

The second one is correct.

The first approach are 2 emits, which would notify all subscribers multiple times.