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