SWIFT & #IOExtendedCLT, 18th May 2016

Transcription

1 SWIFT & #IOExtendedCLT, 18th May 2016

2 Software Engineer at Quoin, 209 Delburg Street, Davidson, NC

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4 Sources tell The Next Web that Google is considering making Swift a first class language for Android, while Facebook and Uber are also looking to make Swift more central to their operations. Google s Android operating system currently supports Java as its firstclass language, and sources say Swift is not meant to replace Java, at least initially. -The Next Web

5 Unfortunately, sources tell The Next Web that Google s current mindset is that Kotlin is a bit too slow when compiling. But, Kotlin is billed as a language that works everywhere Java works, and has seamless support for projects that mix it and Java. -The Next Web

6 DIFFERENCES Obj-C, rooted in C, ARC, created by Apple, so even non-devs know about Swift, very easy to pickup, community support, massive amount of courses, Swift 3.0 won t be backward compatible. Java, JVM, GC, created by JetBrains - mostly Java devs using IntelliJ for Android know about it, requires some level of programming knowledge, JetBrains has committed to long-term backwards compatibility starting with v1.0.

7 THERE ARE 800,000 NEW APP DEVELOPERS EVERY YEAR

8 WHERE TO LEARN FROM stackoverflow.com ~92k/1k vs ~1k/63 [question/votes] youtube.com: ~124k results vs ~2.3k results udacity.com: A. Intro to ios App Development with Swift B. ios Developer Nanodegree edx.com coursera.com

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11 SIMILARITIES open sourced mix of good practices from multiple languages, combination of functional and objective approach, optional types, no nil as we know it, ( Null References: The Billion Dollar Mistake ) all variables must be initialized before using them, extension functions, no semicolons ;D

12 CODE EXAMPLES - OPTIONAL TYPES let n = nil // won t compile (type of expression is ambiguous without more context) let i: Int? = nil // the result is actually Optional<Int>.None var b: String = Google I/O b = nil // won t compile val n = null // won t compile val i: Int? = null var b: String = Google I/O b = null // won t compile

13 CODE EXAMPLES - OPTIONAL TYPES class Department { func description() -> String { return Name class Employee { let department: Department? = nil let sara: Employee? = Employee() sara?.department?.description() sara!.department?.description() sara!.department!.description() //! class Department { fun description() = Name class Employee { let department: Department? = null val sara: Employee? = Employee() sara?.department?.description() sara!!.department?.description() sara!!.department!!.description() //! // implicitly unwrapped values if let department = sara?.department { print(department.description()) // implicitly unwrapped values if (sara!= null && sara.department!= null){ println(sara.department.description())

14 CODE EXAMPLES - EXTENSIONS extension UIColor { class var random: UIColor { switch random()%6 { case 0: return UIColor.greenColor() case 1: return UIColor.blueColor() case 2: return UIColor.yellowColor() case 3: return UIColor.redColor() case 4: return UIColor.purpleColor() default: return UIColor.blackColor() var Color.random: Color get() = when (Math.random().nextInt(6)) { 0 -> Color.GREEN 1 -> Color.BLUE 2 -> Color.YELLOW 3 -> Color.RED 4 -> Color.MAGENTA else -> { Color.BLACK //

15 CODE EXAMPLES - FUNCTIONAL func preparestudentmessages(tutor: Tutor, on date: NSDate) { let matchidandselecteddate = { (m: Message) -> Bool in return m.tutorid == tutor.id && m.date ~= date for message in messages.filter(matchidandselecteddate) { let view = MessageView(message: message) view.origin = calculatetimelineoffset(message.date) //... fun preparestudentmessages(tutor: Tutor, date: NSDate) { val matchidandselecteddate = { m: Message -> m.tutorid == tutor.id && m.date.samedayas(date) for (message in messages.filter(matchidandselecteddate)) { val view = MessageView(message: message) view.origin = calculatetimelineoffset(message.date) //...

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17 USER BASE VS CODE BASE

18 #ifdef greatpresentation #include standing-ovation.hpp #endif THANK YOU!