+(_:_:) Declarationstatic func + (lhs: String, rhs: String) -> String See AlsoAppending Strings and Charactersappend(_:)append(_:)append(contentsOf:)append(contentsOf:)append(contentsOf:)append(contentsOf:)reserveCapacity(_:)+=(_:_:)+(_:_:)+(_:_:)+(_:_:)+=(_:_:)