Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
A Swift Approach (Warsaw 2014)
Search
Kyle Fuller
November 27, 2014
Technology
4
210
A Swift Approach (Warsaw 2014)
Kyle Fuller
November 27, 2014
Tweet
Share
More Decks by Kyle Fuller
See All by Kyle Fuller
Design APIs and deliver what you promised
kylef
0
67
Preparing for the future of API Description Languages
kylef
0
84
Resilient API Design
kylef
1
280
Building a Swift Web API and Application Together
kylef
2
1.9k
Testing without Xcode - CMD+U 2016
kylef
0
220
End-to-end: Building a Web Service in Swift (MCE 2016)
kylef
2
450
Designing APIs for Humans - Write the Docs 2016
kylef
0
280
Embracing Change - MBLTDev 2015
kylef
3
630
Practical Declarative Programming (360 iDev 2015)
kylef
3
460
Other Decks in Technology
See All in Technology
マルチプロダクトな開発組織で 「開発生産性」に向き合うために試みたこと / Improving Multi-Product Dev Productivity
sugamasao
1
300
CysharpのOSS群から見るModern C#の現在地
neuecc
2
3.2k
Python(PYNQ)がテーマのAMD主催のFPGAコンテストに参加してきた
iotengineer22
0
470
Adopting Jetpack Compose in Your Existing Project - GDG DevFest Bangkok 2024
akexorcist
0
110
いざ、BSC討伐の旅
nikinusu
2
780
信頼性に挑む中で拡張できる・得られる1人のスキルセットとは?
ken5scal
2
530
開発生産性を上げながらビジネスも30倍成長させてきたチームの姿
kamina_zzz
2
1.7k
マルチモーダル / AI Agent / LLMOps 3つの技術トレンドで理解するLLMの今後の展望
hirosatogamo
37
12k
OCI Network Firewall 概要
oracle4engineer
PRO
0
4.1k
10XにおけるData Contractの導入について: Data Contract事例共有会
10xinc
6
620
AWS Media Services 最新サービスアップデート 2024
eijikominami
0
200
TanStack Routerに移行するのかい しないのかい、どっちなんだい! / Are you going to migrate to TanStack Router or not? Which one is it?
kaminashi
0
580
Featured
See All Featured
A Modern Web Designer's Workflow
chriscoyier
693
190k
Build your cross-platform service in a week with App Engine
jlugia
229
18k
Writing Fast Ruby
sferik
627
61k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
126
18k
Why Our Code Smells
bkeepers
PRO
334
57k
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
mongodb
42
9.2k
Side Projects
sachag
452
42k
Done Done
chrislema
181
16k
Optimizing for Happiness
mojombo
376
70k
GraphQLの誤解/rethinking-graphql
sonatard
67
10k
Code Reviewing Like a Champion
maltzj
520
39k
Mobile First: as difficult as doing things right
swwweet
222
8.9k
Transcript
A SWIFT APPROACH KYLEFULLER
KYLEFULLER
None
None
NEW CONCEPTS
RUNTIME
@objc / NSObject
NSKeyValueObserving
RUNTIME
WWDC 2015
OPTIONALS?
func compute() -> Bool?
true false neither
LACK OF A VALUE
NOT AN EMPTY VALUE
CAN'T WE DO THIS IN OBJECTIVE-C?
nil Nil NULL CGRectNull -1 0 NSNotFound NSNull ...
EXPRESS YOU DON'T ACCEPT NIL
EXPRESS YOU WILL NOT RETURN NIL
/// You **MUST** pass in a URL - (instancetype)initWithURL:(NSURL *)URL
{ NSParameterAssert(URL != nil); }
- (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)path { return nil; }
None
RUNTIME ERROR
RUNTIME ERROR
COMPILE ERROR
None
TUPLES
func get(username:String) -> (Person?, NSError?)
let person, error = get("Kyle")
OBJECTIVE-C
NSError *error; Person *person = [Person getPerson:@"Kyle" error:&error];
NAMED TUPLES
func get(username:String) -> (person:Person?, error:NSError?)
let result = get("Kyle") result.person result.error
- (NSArray *)getPerson:(NSString *)username; - (NSDictionary *)getPerson:(NSString *)username;
NSDictionary *components = [Person getPerson:@"kyle"]; Person *person = components["person"]; NSError
*error = components["error"];
TYPE SAFETY?
FRAGILE
ENUMERATIONS
enum Result { case Success(String) case Error(Error) }
switch result { case .Error(let error): println("There was an error
(\(error)).") case .Success(let string): println("\(string)") }
CLOSURES
EVERYTHING IS A CLOSURE
class TestObject { func testA() -> () { println("first test")
} var testB:(() -> ()) = { println("second test") } }
let testing = TestObject() testing.testA() testing.testB()
testing.testB = testing.testA
testing.testB() // Actually calls testA
CONSISTENCY
FUNCTIONAL
None
let string = "Hello World" let matches:[NSTextCheckingResult] = /* regex
for words in string */ matches.map { string.substringWithRange($0.range) }
let string = "Hello World" let matches:[NSTextCheckingResult] = /* regex
for words in string */ var strings = [String]() for match in matches { let catch = string.substringWithRange(match.range) strings.append(catch) }
func reduce(initial, combine) -> result
combine : ((previous, current) -> (result))
let items = [["a", "b"], ["c", "d"], ["e"]] items.reduce([]) {
initial, expressions -> [String] in initial + expressions } => ["a", "b", "c", "d", "e"]
let items = [["a", "b"], ["c", "d"], ["e"]] items.reduce([], +)
=> ["a", "b", "c", "d", "e"]
func +<T>(lhs:[T], rhs:[T]) -> [T]
items.sort { $0 > $1 }
items.sort(>)
items.filter { $0.hasPermission }
func isAdmin(user:User) -> Bool { return user.username == "Kyle" }
users.filter(isAdmin)
GENERICS
Array<String>
Dictionary<String, Int>
func max<T : Comparable>(a:T, b:T) -> T { return a
> b ? a : b }
max(anInteger, anotherInteger) max(aFloat, anotherFloat) max(aString, anotherString)
PATTERN MATCHING
let point = (1, 2) switch point { case (0,
0): println("(0, 0) is at the origin.") case (-2...2, -2...2): println("(\(point.0), \(point.1)) is near the origin.") default: println("The point is at (\(point.0), \(point.1)).") } // prints "(1, 2) is near the origin."
@auto_closure
delay(5, println("Hello World"))
func delay(time:UInt32, block:@auto_closure) { sleep(time) block() }
BUILDING ASSERT() IN SWIFT
assert(someExpensiveComputation() != 42)
func assert(predicate : () -> Bool) { #if !NDEBUG if
!predicate() { abort() } #endif }
PLAYGROUNDS
PLAYGROUNDS
SWIFT
SAFER
CONVENTIONS
CONVENTIONS
LANGUAGE CONSTRAINTS
BETTER CODE
BETTER DEVELOPERS
LESS BUGS
WE'RE ALL BEGINNERS
PERFECTING
BREAKING CHANGES
- Xcode 6.1 + Xcode 6.1.1
FOR GOOD, NOT EVIL
!
FILE RADARS
FUTURE
COMMON DESIGN PATTERNS
KYLEFULLER