Radek Pietruszewski | Swifty Methods

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Radek

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“Programs must be written for people to read, and only incidentally for machines to execute” — Structure and Interpretation of Computer Programs

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“Programs must be written for people to read, and only incidentally for machines to execute”

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Clarity

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Clever is dumb

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Clarity is worth it

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No content

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clarity ≠ verbosity

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naming things

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naming things stringByReplacingOccurrencesOfString:withString:

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naming things stringByReplacingOccurrencesOfString:withString: performSelectorOnMainThread:withObject:waitUntilDone:

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naming things stringByReplacingOccurrencesOfString:withString: performSelectorOnMainThread:withObject:waitUntilDone: tableView:targetIndexPathForMoveFromRowAtIndexPath:toProposedI

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[string componentsSeparatedByString:@"\n"];

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[string componentsSeparatedByString:@"\n"]; huh?

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[string componentsSeparatedByString:@"\n"]; huh? NSComponent?

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[string componentsSeparatedByString:@"\n"]; 95% clear

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[string componentsSeparatedByString:@"\n"]; 100% verbose 95% clear

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string.split("\n")

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string.split("\n") 95% clear

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Adding more words doesn't help

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What if you’re not sure?

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No content

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split componentsSeparatedByString

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Why save bytes?

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clarity > brevity

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brevity ⊂ clarity

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Verbosity ain't free

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Reading takes effort

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clear > confusing short > verbose

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Find the sweet spot

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Remove the noise

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split componentsSeparatedByString

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replace stringByReplacingOccurencesOfString:withString:

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stringByReplacingOccurencesOfString:withString:

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stringByReplacingOccurencesOfString:withString:

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replace

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Remove the noise

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let today : NSDate = NSDate()

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let today = NSDate()

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ty(activityType: "hash_state") rInfo = ["hash": hash] SURL(string: fallbackURL) omeCurrent() ity = activity ; ; ; ; ;

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ty(activityType: "hash_state") rInfo = ["hash": hash] SURL(string: fallbackURL) omeCurrent() ity = activity

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let array: [Int] = [10, 6, 2] array.reduce(0, { (acc: Int, el: Int) -> Int in return acc + el })

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let array = [10, 6, 2] array.reduce(0, +)

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string1 string2 [ isEqualToString: ]

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string1 string2

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string1 == string2

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if (foo && foo.bar) { foo.bar.baz() }

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foo?.bar?.baz()

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less code to understand is a good thing

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[[NSWindow alloc] initWithContentRect: frame styleMask: NSTitledWindowMask backing: NSBackingStoreBuffered defer: NO screen: nil]

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[[NSWindow alloc] initWithContentRect: frame styleMask: NSTitledWindowMask backing: NSBackingStoreBuffered defer: NO screen: nil]

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init( contentRect: NSRect, styleMask: NSWindowMask = .Titled, backing: NSBackingStoreType = .Buffered, defer: Bool = false, screen: NSScreen? = nil)

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[[NSWindow alloc] initWithContentRect: frame styleMask: NSTitledWindowMask backing: NSBackingStoreBuffered defer: NO screen: nil]

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NSWindow(contentRect: frame)

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Swifty APIs

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[NSTimer scheduledTimerWithTimeInterval: 1.0 target: self selector: @selector(foo:) userInfo: nil repeats: YES] . . . - (void) foo: (NSTimer *timer) { NSLog(@“Hello world!”) } radex.io/swift/nstimer

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[NSTimer scheduledTimerWithTimeInterval:1.0] radex.io/swift/nstimer

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[NSTimer scheduledTimerWithTimeInterval:1.0] radex.io/swift/nstimer

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[NSTimer scheduledTimerWithTimeInterval:1.0] radex.io/swift/nstimer

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[NSTimer scheduledTimerWithTimeInterval:1.0] radex.io/swift/nstimer

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NSTimer.schedule(interval: 1.0) radex.io/swift/nstimer

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NSTimer.schedule(interval: 1.0, target: self, selector: "foo:", userInfo: nil, repeats: true) func foo(timer: NSTimer) { println("Hello world") } radex.io/swift/nstimer

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NSTimer.schedule(interval: 1.0, userInfo: nil, repeats: true) { println("Hello world") } radex.io/swift/nstimer

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NSTimer.schedule(interval: 1.0, repeats: true) { println("Hello world") } radex.io/swift/nstimer

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NSTimer.schedule(every: 1.0) { println("Hello world") } radex.io/swift/nstimer

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NSTimer.schedule(every: 1.second) { println("Hello world") } radex.io/swift/nstimer

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NSTimer.schedule(after: 1.second) { println("Hello world") } radex.io/swift/nstimer

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NSTimer.schedule(every: 1.second) { println("Hello world") } radex.io/swift/nstimer