Keep only values which satisfy a predicate
Keep only values which satisfy a predicate
a new FutureOption
Returns the result of applying f to this FutureOption if this FutureOption is not empty
Returns the result of applying f to this FutureOption if this FutureOption is not empty
a new FutureOption
Returns the result of applying f to this FutureOption if this FutureOption is not empty
Returns the result of applying f to this FutureOption if this FutureOption is not empty
a new FutureOption
Keep only values which satisfy a predicate
Keep only values which satisfy a predicate
a new FutureOption