Operatorswift 6.1.2Swift
<(_:_:)
Returns a Boolean value indicating whether the first tuple is ordered before the second in a lexicographical ordering.
func < <A, B>(lhs: (A, B), rhs: (A, B)) -> Bool where A : Comparable, B : Comparable Parameters
Given two tuples (a1, a2, ..., aN) and (b1, b2, ..., bN), the first tuple is before the second tuple if and only if a1 < b1 or (a1 == b1 and (a2, ..., aN) < (b2, ..., bN)).