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Jack Nutting | let swift = Race?
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Swift Summit
March 22, 2015
Programming
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2.7k
Jack Nutting | let swift = Race?
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www.swiftsummit.com
Swift Summit
March 22, 2015
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Transcript
let swift: Race? Jack Nutting @jacknutting
[email protected]
let swift: Race?
struct Sun { let swift: Race?
let strong: Battle? let wise: Bread? let intelligent: Riches? let knowledgeable: Favor? init() { swift = TimeAndChance() ? Race() : .None strong = TimeAndChance() ? Battle() : .None wise = TimeAndChance() ? Bread() : .None intelligent = TimeAndChance() ? Riches() : .None knowledgeable = TimeAndChance() ? Favor() : .None } }
let swift: Race?
None
[[somePeople like:ObjectiveC] evenIn:2015]
[[[[[[receiver method] method] method] method] method]
method]; receiver.method().method().method() .method().method().method()
Static fixed, stable, steady, consistent motionless, frozen, inert, lifeless
enum
enum Button { case Rectangular(bounds: CGRect,
title: String, font: UIFont) case RoundedCorners(bounds: CGRect, title: String, font: UIFont, radius: CGFloat) }
extension Button { func draw() {
switch self { case let .Rectangular(bounds, title, font): drawRectangleButton(bounds, title, font) case let .RoundedCorners(bounds, title, font, radius): drawRoundedRectangleButton(bounds, title, font, radius) } } }
extension Button { func buttonOfPreferredSize() -‐>
CGSize { switch self { case let .Rectangular(bounds, title, font): return preferredSizeForRectangleButton(bounds, title, font) case let .RoundedCorners(bounds, title, font, radius): return preferredSizeForRoundedRectangleButton(bounds, title, font, radius) } } }
• My Way or the Highway • Eternal Vigilance •
Boilerplate
If a huge chunk of your enum’s code is just
switching on the type, maybe you should just use a set of classes.
Using struct instead of class Marking classes as final Marking
methods as final
Future developers will want the flexibility to extend your system
in ways you can’t foresee.
–Sir Tony Hoare “Premature optimization is the root of all
evil.”
C++
–Jack Nutting “All of C++ is premature optimization.”
Functional Programming is not a silver bullet
http://chris.eidhof.nl/ posts/lenses-in-swift.html
https://www.destroyallsoftware.com/ talks/boundaries
Conclusions Sometimes enums aren’t the answer. Static has drawbacks. All
of C++ is premature optimization. FP is not a silver bullet.
Jack Nutting @jacknutting
[email protected]
let swift: Race?