firestar5683
45 lines
1.1 KiB
Python
45 lines
1.1 KiB
Python
from typing import Any, Callable, Optional, TypeVar
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from reactivex import Observable, operators
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from reactivex.typing import Predicate
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from ._lastordefault import last_or_default_async
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_T = TypeVar("_T")
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def last_(
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predicate: Optional[Predicate[_T]] = None,
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) -> Callable[[Observable[_T]], Observable[Any]]:
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def last(source: Observable[_T]) -> Observable[Any]:
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"""Partially applied last operator.
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Returns the last element of an observable sequence that
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satisfies the condition in the predicate if specified, else
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the last element.
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Examples:
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>>> res = last(source)
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Args:
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source: Source observable to get last item from.
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Returns:
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An observable sequence containing the last element in the
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observable sequence that satisfies the condition in the
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predicate.
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"""
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if predicate:
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return source.pipe(
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operators.filter(predicate),
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operators.last(),
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)
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return last_or_default_async(source, False)
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return last
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__all__ = ["last_"]
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