64 lines
2.0 KiB
GDScript3
64 lines
2.0 KiB
GDScript3
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static func first_or_default_async_(
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has_default : bool = false, default_value = null
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) -> Callable:
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var first_or_default_async = func(source : Observable) -> Observable:
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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 on_next = func(x):
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observer.on_next(x)
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observer.on_completed()
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var on_completed = func():
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if not has_default:
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observer.on_error(SequenceContainsNoElementsError.new())
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else:
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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 first_or_default_async
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static func first_or_default_(
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predicate = null,
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default_value = null
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) -> Callable:
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# """Returns the first element of an observable sequence that
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# satisfies the condition in the predicate, or a default value if no
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# such element exists.
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#
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# Examples:
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# >>> var res = source.pipe1(GDRx.op.first_or_default())
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# >>> var res = source.pipe1(GDRx.op.first_or_default(func(x): return x > 3))
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# >>> var res = source.pipe1(GDRx.op.first_or_default(func(x): return x > 3, 0))
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# >>> var res = source.pipe1(GDRx.op.first_or_default(null, 0))
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#
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# Args:
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# source -- Observable sequence.
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# predicate -- [optional] A predicate function to evaluate for
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# elements in the source sequence.
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# default_value -- [Optional] The default value if no such element
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# exists. If not specified, defaults to None.
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#
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# Returns:
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# A function that takes an observable source and reutrn an
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# observable sequence containing the first element in the
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# observable sequence that satisfies the condition in the
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# predicate, or a default value if no such element exists.
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# """
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if predicate != null:
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var predicate_ : Callable = predicate
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return GDRx.pipe.compose2(
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GDRx.op.filter(predicate_),
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GDRx.op.first_or_default(null, default_value)
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)
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return first_or_default_async_(true, default_value)
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