Default if empty¶
See also
- Official ReactiveX documentation: DefaultIfEmpty
-
Observable.
default_if_empty
(default_value=None)¶ Returns the elements of the specified sequence or the specified value in a singleton sequence if the sequence is empty.
res = obs = xs.defaultIfEmpty() obs = xs.defaultIfEmpty(False
Keyword arguments: default_value – The value to return if the sequence is empty. If not
provided, this defaults to None.Returns an observable {Observable} sequence that contains the specified default value if the source is empty otherwise, the elements of the source itself.