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Swift Swiftly
A quick introduction to the Swift language
Oliver Jones
Technical Director
Disclaimer
Swift Swiftly A quick introduction to the Swift language Oliver - - PowerPoint PPT Presentation
Swift Swiftly A quick introduction to the Swift language Oliver - - PowerPoint PPT Presentation
Swift Swiftly A quick introduction to the Swift language Oliver Jones Technical Director Disclaimer Learning Swift iBooks The Swift Programming Language Using Swift with Cocoa and Objective-C Apple Developer Documentation
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Learning Swift
- iBooks
- The Swift Programming Language
- Using Swift with Cocoa and Objective-C
- Apple Developer Documentation
- WWDC 2014 Videos
- Apple Developer Forums
- Blogs, Github, Stack Overflow, etc
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What is Swift?
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- A new programming language introduced at Apple’s
WWDC 2014 in June
- Designed/Created by Chris Lattner
- Apple Developer Tools department Director and
Architect
- LLVM compiler project founder
What is Swift?
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What is Swift?
Objective-C without C
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Rusty Objective-C#++
What is Swift?
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Swift IS NOT Objective-C
(with new syntax)
What is Swift?
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Swift Code
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- Native (x86 & ARM), Compiled
- Strongly Typed
- Designed for OS X and iOS developers
- Intended to eventually replace Objective-C
- Closed source (for now)
What is Swift?
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Notable Features
- Bridges seamlessly to C & Objective-C (mostly)
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- Type Inference & Explicitly mutable/immutable variables.
Notable Features
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- Generics
Notable Features
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- Operator Overloading
Notable Features
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- Classes/Reference Types (objects) & Value Types (structs, enums)
Notable Features
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- First Class Functions & Closures
Notable Features
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- Tuples
Notable Features
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- Type Extensions
Notable Features
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Optional Types
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- By default variables in Swift must be initialised with a value.
- Optional types allow those variables to be assigned a nil
value.
- This applies to variables of any type not just object
references.
What are ? Optional Types
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Example
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- Tony Hoare’s Billion Dollar Mistake
- Creator of QuickSort and ALGOL W
I call it my billion-dollar mistake. It was the invention of the null reference in 1965. At that time, I was designing the first comprehensive type system for references in an object
- riented language (ALGOL W). My goal was to ensure that
all use of references should be absolutely safe, with checking performed automatically by the compiler. But I couldn't resist the temptation to put in a null reference, simply because it was so easy to implement. This has led to innumerable errors, vulnerabilities, and system crashes, which have probably caused a billion dollars of pain and damage in the last forty years.
“ ”
Why Optional Types?
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Pattern Matching
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What is ?
- No I don’t mean Regular Expressions
- Pattern matching in Swift is provided by a switch statement
with super powers.
Pattern Matching
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Example
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Example
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Example
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Example
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- Exception handling
- Macros
- Collections beyond Array & Dictionary
- Limited RTTI/Reflection API
- Developer definable attributes
- No language level support for asynchronous code
Notable Omissions
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(But you should learn Objective-C too.)
Should you learn Swift?
YES!
Should you learn Swift?
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(But you should be developing something.)
Should you deliver in Swift?
Hell No!
Should you deliver in Swift?
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Thank You.
@orj