Given a sequence of as
, combine them and return the total.
Given a sequence of as
, combine them and return the total.
If the sequence is empty, returns None. Otherwise, returns Some(total).
Return a
combined with itself n
times.
Return a
combined with itself more than once.
Return a
combined with itself more than once.
A semigroup is any set
A
with an associative operation (combine
).