43 lines
1020 B
GDScript3
43 lines
1020 B
GDScript3
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static func default_if_empty_(
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default_value = null
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) -> Callable:
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var default_if_empty = func(source : Observable) -> Observable:
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# """Returns the elements of the specified sequence or the
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# specified value in a singleton sequence if the sequence is
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# empty.
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#
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# Examples:
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# >>> var obs = default_if_empty.call(source)
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#
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# Args:
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# source: Source observable.
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#
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# Returns:
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# An observable sequence that contains the specified default
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# value if the source is empty otherwise, the elements of the
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# source.
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# """
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var subscribe = func(
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observer : ObserverBase,
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scheduler : SchedulerBase = null
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) -> DisposableBase:
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var found = [false]
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var on_next = func(x):
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found[0] = true
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observer.on_next(x)
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var on_completed = func():
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if not found[0]:
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observer.on_next(default_value)
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observer.on_completed()
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return source.subscribe(
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on_next, observer.on_error, on_completed,
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scheduler
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)
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return Observable.new(subscribe)
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return default_if_empty
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