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What are the changes in Swift 2.0?

Swift version: 5.2

Paul Hudson    @twostraws   

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
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