46 lines
1.2 KiB
GDScript3
46 lines
1.2 KiB
GDScript3
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static func take_last_(count : int) -> Callable:
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var take_last = func(source : Observable) -> Observable:
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# """Returns a specified number of contiguous elements from the end of an
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# observable sequence.
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#
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# Example:
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# >>> var res = take_last.call(source)
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#
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# This operator accumulates a buffer with a length enough to store
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# elements count elements. Upon completion of the source sequence, this
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# buffer is drained on the result sequence. This causes the elements to be
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# delayed.
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#
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# Args:
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# source: Number of elements to take from the end of the source
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# sequence.
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#
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# Returns:
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# An observable sequence containing the specified number of elements
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# from the end of the source sequence.
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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 q : Array = []
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var on_next = func(x):
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q.append(x)
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if q.size() > count:
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q.pop_front()
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var on_completed = func():
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while !q.is_empty():
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observer.on_next(q.pop_front())
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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 take_last
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