Nah, I switched to Swift at v1.0, the transitions have been relatively easy. Right now our app has 90k lines of code so Swift 3 was a day of work, but mostly au

Nah, I switched to Swift at v1.0, the transitions have been relatively easy. Right now our app has 90k lines of code so Swift 3 was a day of work, but mostly automated. Swift 4 is automatic. The trick to making the transitions easy is to not abuse the language with too clever code. Write clear, straightforward and easily msinatainavle code and it will rarely be broken.