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Radek Pietruszewski | Swifty Methods
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Swift Summit
March 22, 2015
Programming
2
7.6k
Radek Pietruszewski | Swifty Methods
Presented at
www.swiftsummit.com
Swift Summit
March 22, 2015
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Transcript
Radek
“Programs must be written for people to read, and only
incidentally for machines to execute” — Structure and Interpretation of Computer Programs
“Programs must be written for people to read, and only
incidentally for machines to execute”
Clarity
Clever is dumb
Clarity is worth it
None
clarity ≠ verbosity
naming things
naming things stringByReplacingOccurrencesOfString:withString:
naming things stringByReplacingOccurrencesOfString:withString: performSelectorOnMainThread:withObject:waitUntilDone:
naming things stringByReplacingOccurrencesOfString:withString: performSelectorOnMainThread:withObject:waitUntilDone: tableView:targetIndexPathForMoveFromRowAtIndexPath:toProposedI
[string componentsSeparatedByString:@"\n"];
[string componentsSeparatedByString:@"\n"]; huh?
[string componentsSeparatedByString:@"\n"]; huh? NSComponent?
[string componentsSeparatedByString:@"\n"]; 95% clear
[string componentsSeparatedByString:@"\n"]; 100% verbose 95% clear
string.split("\n")
string.split("\n") 95% clear
Adding more words doesn't help
What if you’re not sure?
None
split componentsSeparatedByString
Why save bytes?
clarity > brevity
brevity ⊂ clarity
Verbosity ain't free
Reading takes effort
clear > confusing short > verbose
Find the sweet spot
Remove the noise
split componentsSeparatedByString
replace stringByReplacingOccurencesOfString:withString:
stringByReplacingOccurencesOfString:withString:
stringByReplacingOccurencesOfString:withString:
replace
Remove the noise
let today : NSDate = NSDate()
let today = NSDate()
ty(activityType: "hash_state") rInfo = ["hash": hash] SURL(string: fallbackURL) omeCurrent() ity
= activity ; ; ; ; ;
ty(activityType: "hash_state") rInfo = ["hash": hash] SURL(string: fallbackURL) omeCurrent() ity
= activity
let array: [Int] = [10, 6, 2] array.reduce(0, { (acc:
Int, el: Int) -> Int in return acc + el })
let array = [10, 6, 2] array.reduce(0, +)
string1 string2 [ isEqualToString: ]
string1 string2
string1 == string2
if (foo && foo.bar) { foo.bar.baz() }
foo?.bar?.baz()
less code to understand is a good thing
[[NSWindow alloc] initWithContentRect: frame styleMask: NSTitledWindowMask backing: NSBackingStoreBuffered defer: NO
screen: nil]
[[NSWindow alloc] initWithContentRect: frame styleMask: NSTitledWindowMask backing: NSBackingStoreBuffered defer: NO
screen: nil]
init( contentRect: NSRect, styleMask: NSWindowMask = .Titled, backing: NSBackingStoreType =
.Buffered, defer: Bool = false, screen: NSScreen? = nil)
[[NSWindow alloc] initWithContentRect: frame styleMask: NSTitledWindowMask backing: NSBackingStoreBuffered defer: NO
screen: nil]
NSWindow(contentRect: frame)
Swifty APIs
[NSTimer scheduledTimerWithTimeInterval: 1.0 target: self selector: @selector(foo:) userInfo: nil repeats:
YES] . . . - (void) foo: (NSTimer *timer) { NSLog(@“Hello world!”) } radex.io/swift/nstimer
[NSTimer scheduledTimerWithTimeInterval:1.0] radex.io/swift/nstimer
[NSTimer scheduledTimerWithTimeInterval:1.0] radex.io/swift/nstimer
[NSTimer scheduledTimerWithTimeInterval:1.0] radex.io/swift/nstimer
[NSTimer scheduledTimerWithTimeInterval:1.0] radex.io/swift/nstimer
NSTimer.schedule(interval: 1.0) radex.io/swift/nstimer
NSTimer.schedule(interval: 1.0, target: self, selector: "foo:", userInfo: nil, repeats: true)
func foo(timer: NSTimer) { println("Hello world") } radex.io/swift/nstimer
NSTimer.schedule(interval: 1.0, userInfo: nil, repeats: true) { println("Hello world") }
radex.io/swift/nstimer
NSTimer.schedule(interval: 1.0, repeats: true) { println("Hello world") } radex.io/swift/nstimer
NSTimer.schedule(every: 1.0) { println("Hello world") } radex.io/swift/nstimer
NSTimer.schedule(every: 1.second) { println("Hello world") } radex.io/swift/nstimer
NSTimer.schedule(after: 1.second) { println("Hello world") } radex.io/swift/nstimer
[NSTimer scheduledTimerWithTimeInterval: 1.0 target: self selector: @selector(foo:) userInfo: nil repeats:
YES] . . . - (void) foo: (NSTimer *timer) { NSLog(@“Hello world!”) } radex.io/swift/nstimer
NSTimer.schedule(every: 1.second) { println("Hello world") } radex.io/swift/nstimer
Recap: 4 ideas
Focus on clarity
Don't write clever code
clarity ≠ verbosity
None
radex.io/swift/methods @radexp