def flat_map_latest(source: Observable[_T1]) -> Observable[_T2]:
"""Projects each element of an observable sequence into a new
sequence of observable sequences by incorporating the element's
index and then transforms an observable sequence of observable
sequences into an observable sequence producing values only
from the most recent observable sequence.
Args:
source: Source observable to flat map latest.
Returns:
An observable sequence whose elements are the result of
invoking the transform function on each element of source
producing an observable of Observable sequences and that at
any point in time produces the elements of the most recent
inner observable sequence that has been received.
"""
return source.pipe(
ops.map(mapper),
ops.switch_latest(),
)
def create():
return xs.pipe(ops.switch_latest())