Returns an Aggregator that selects the first instance of T
in the aggregated stream.
Returns a Semigroup instance with a plus
implementation
that always returns the first (ie, the left) T
argument.
Returns a Semigroup instance with a plus
implementation
that always returns the first (ie, the left) T
argument.
This semigroup's sumOption
is efficient; it only selects the
head of the TraversableOnce
instance, leaving the rest
untouched.
Provides a set of operations and typeclass instances needed to use First instances.