What are the changes in Swift 2.0?

Swift version: 5.1

Paul Hudson @twostraws May 28th 2019

Swift 2.0 introduced a lot of major language changes. You can read my full article explaining the changes with code examples by clicking here, but here are the highlights:

Checked exceptions using try/catch
Automatically synthesized headers
The guard keyword to check input while unwrapping optionals
Measuring strings is now done using characters.count (Note: this was later un-done in Swift 4.)
Delayed code execution using the defer keyword
You now get mutability warnings if you declare variables that never get changed
API availability checking is now built right in
The performSelector() family of functions is now available