Optionals

What are the optional subjects for the civil services exam? Can one get through the civil services just by scoring high marks in the optional subjects? - Quora

Understanding Optionals in Swift

3 mistakes to avoid with Optionals — Swift with Vincent

Combine two Java Optionals •

How to use Swift's optionals and unwrapping techniques

Swift Optionals Explained: How to use them and what are they (iOS for Beginners)

Swift Essentials: Optionals

Plate Carrier Optionals - Novritsch

Optional Competitions

ELI 5 - Optionals and jargons

Optionals - a free Hacking with Swift tutorial

The Nested OPTIONALs problem.

Mastering Swift Optionals: Unwrapping, Nil Handling, and Chaining, by PoojaBabusingh

swift - Difference between Force Unwrapping Optionals and Implicitly Unwrapped Optionals - Stack Overflow

Optionals - a free Hacking with Swift tutorial