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Swift Kombat

Wang Fuqiang

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Let ChatGPT help to write some Swift code looks a bit strenuous, so, simply scan the syntax of Swift:

• The protocol in swift is similar to scala’s trait or java’s interface
• Extension can add new functions to existing types, which is a bit similar to the extension method of scala3.
  • Protocol extension is a special case of extension .
• throw Error (instead of throw Exceptions like java/scala)
• do-catch (instead of try-catch like java/scala)
• nil (corresponding to null in java/scala)
• “Your name is (name)” (corresponding to string interpolation ${...} in scala, also called string interpolation in swift, but use \(...) , variable name or expression)
• if and if let (and guard let) are not the same expressions, https://ift.tt/IObJvlM, if let is a bit The taste of option in Scala, the function is unwrap optional binding
• The parameters of functions can specify two names, one for external calls and one for internal references, https://ift.tt/gImk08v
• func countLettersInString(myString str: String)
• struct , similar to scala case class, data container data structure, or kotlin data class
• Mandatory type conversion , as? , such as let studioAlbum = album as? StudioAlbum (this will make studioAlbum have the data type StudioAlbum? , That is, an optional studio album), in fact, I have always hoped that Scala can make that smelly and long asInstanceOf or have a similar short form.
• Trailing closures , the last parameter can use syntactic sugar (if the last parameters to a method are closures, you can eliminate those parameters and instead provide them as a block of code inside braces.), this is a bit similar to scala, only However, scala is placed in a separate parameter declaration.

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