sumOf
Sums selector once per element in iteration order, returning Int zero when empty. No collection is allocated; selector/iterator exceptions and inline non-local returns propagate. Addition uses ordinary wrapping Int arithmetic.
Sums selector once per element in iteration order, returning Long zero when empty. No collection is allocated; selector/iterator exceptions and inline non-local returns propagate. Addition uses ordinary wrapping Long arithmetic.
Sums selector once per element in iteration order, returning Double zero when empty. No collection is allocated; selector/iterator exceptions and inline non-local returns propagate. Addition retains ordinary Double rounding, infinities and NaN.
Sums selector once per element in iteration order, returning UInt zero when empty. No collection is allocated; selector/iterator exceptions and inline non-local returns propagate. Addition uses ordinary wrapping UInt arithmetic.
Sums selector once per element in iteration order, returning ULong zero when empty. No collection is allocated; selector/iterator exceptions and inline non-local returns propagate. Addition uses ordinary wrapping ULong arithmetic.