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@skentphd iOS & Android & Swift & Kotlin

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@skentphd Who? Stuart Kent stkent.com @skentphd http://bit.ly/cocoaheads-july-2017

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@skentphd Who? Stuart Kent stkent.com @skentphd http://bit.ly/cocoaheads-july-2017

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@skentphd ! What?

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@skentphd $ What Not?

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@skentphd Why?

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@skentphd For common topics: • Illustrate similarities by comparing code. • Discuss differences and mitigation strategies. Recommend resources & tactics. Q&As. How?

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@skentphd • Languages • Architecture • Layouts Topics

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@skentphd • Application lifecycle • Networking • Continuous Integration • Distribution • Soft Skills ❤ Not Topics

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@skentphd • IDEs (mostly) • Frameworks Also Not Topics

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@skentphd Level Check

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@skentphd Me Android Java Kotlin iOS Objective-C Swift

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@skentphd You? iOS Objective-C Swift Android Java Kotlin

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@skentphd Languages

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@skentphd Principles • Safe • Expressive • Concise • Multi-paradigm • Fast • Interoperable

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@skentphd Principles • Safe • Expressive • Concise • Multi-paradigm • Fast • Interoperable

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@skentphd Syntax & Capabilities

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@skentphd Swift 4 class User { let first: String let last: String? init( first: String, last: String? = nil) { self.first = first self.last = last } } class User { val first: String val last: String? constructor( first: String, last: String? = null) { this.first = first this.last = last } } Kotlin 1.1.3

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@skentphd Swift class User { let first: String let last: String? init( first: String, last: String? = nil) { self.first = first self.last = last } } class User { val first: String val last: String? constructor( first: String, last: String? = null) { this.first = first this.last = last } } Kotlin

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@skentphd Swift class User { let first: String let last: String? init( first: String, last: String? = nil) { self.first = first self.last = last } } class User { val first: String val last: String? constructor( first: String, last: String? = null) { this.first = first this.last = last } } Kotlin

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@skentphd Swift class User { let first: String let last: String? init( first: String, last: String? = nil) { self.first = first self.last = last } } class User { val first: String val last: String? constructor( first: String, last: String? = null) { this.first = first this.last = last } } Kotlin

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@skentphd Swift class User { let first: String let last: String? init( first: String, last: String? = nil) { self.first = first self.last = last } } class User { val first: String val last: String? constructor( first: String, last: String? = null) { this.first = first this.last = last } } Kotlin

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@skentphd Swift let stuart = User(first: "stuart", last: "kent") Kotlin val stuart = User(first = "stuart", last = "kent")

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@skentphd Swift let stuart = User(first: "stuart", last: "kent") stuart.first // "stuart" Kotlin val stuart = User(first = "stuart", last = "kent") stuart.first // "stuart"

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@skentphd Swift let stuart = User(first: "stuart", last: "kent") stuart.first // "stuart" stuart.last // "kent" Kotlin val stuart = User(first = "stuart", last = "kent") stuart.first // "stuart" stuart.last // "kent"

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@skentphd Swift let stuart = User(first: "stuart", last: "kent") stuart.first // "stuart" stuart.last // "kent" "\(stuart.first) \(stuart.last)" // "stuart Optional("kent")" Kotlin val stuart = User(first = "stuart", last = "kent") stuart.first // "stuart" stuart.last // "kent" "${stuart.first} ${stuart.last}" // "stuart kent"

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@skentphd Swift let eminem = User(first: "eminem") Kotlin val eminem = User(first = "eminem")

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@skentphd Swift let eminem = User(first: "eminem") eminem.first // "eminem" Kotlin val eminem = User(first = "eminem") eminem.first // "eminem"

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@skentphd Swift let eminem = User(first: "eminem") eminem.first // "eminem" eminem.last // nil Kotlin val eminem = User(first = "eminem") eminem.first // "eminem" eminem.last // null

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@skentphd Swift let eminem = User(first: "eminem") eminem.first // "eminem" eminem.last // nil "\(eminem.first) \(eminem.last)" // "eminem nil" Kotlin val eminem = User(first = "eminem") eminem.first // "eminem" eminem.last // null "${eminem.first} ${eminem.last}" // "eminem null"

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@skentphd Swift class User { // ... func fullName() -> String { return [first, last] .flatMap { $0 } .joined(separator: " ") } } class User { // ... fun fullName(): String { return arrayOf(first, last) .filterNotNull() .joinToString(" ") } } Kotlin

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@skentphd Swift class User { // ... func fullName() -> String { return [first, last] .flatMap { $0 } .joined(separator: " ") } } class User { // ... fun fullName(): String { return arrayOf(first, last) .filterNotNull() .joinToString(" ") } } Kotlin

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@skentphd Swift class User { // ... func fullName() -> String { return [first, last] .flatMap { $0 } .joined(separator: " ") } } class User { // ... fun fullName(): String { return arrayOf(first, last) .filterNotNull() .joinToString(" ") } } Kotlin

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@skentphd Swift class User { // ... func fullName() -> String { return [first, last] .flatMap { $0 } .joined(separator: " ") } } class User { // ... fun fullName(): String { return arrayOf(first, last) .filterNotNull() .joinToString(" ") } } Kotlin

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@skentphd Swift class User { // ... func fullName() -> String { return [first, last] .flatMap { $0 } .joined(separator: " ") } } class User { // ... fun fullName(): String { return arrayOf(first, last) .filterNotNull() .joinToString(" ") } } Kotlin

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@skentphd Swift class User { // ... func fullName() -> String { return [first, last] .flatMap { $0 } .joined(separator: " ") } } stuart.fullName() // "stuart kent" eminem.fullName() // "eminem" class User { // ... fun fullName(): String { return arrayOf(first, last) .filterNotNull() .joinToString(" ") } } stuart.fullName() // "stuart kent" eminem.fullName() // "eminem" Kotlin

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@skentphd Swift extension String { func cap() -> String { guard !isEmpty else { return "" } return String(uppercased().first!) + dropFirst() } } fun String.cap(): String { if (isEmpty()) return "" return toUpperCase().first() + drop(1) } Kotlin

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@skentphd Swift extension String { func cap() -> String { guard !isEmpty else { return "" } return String(uppercased().first!) + dropFirst() } } fun String.cap(): String { if (isEmpty()) return "" return toUpperCase().first() + drop(1) } Kotlin

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@skentphd Swift extension String { func cap() -> String { guard !isEmpty else { return "" } return String(uppercased().first!) + dropFirst() } } fun String.cap(): String { if (isEmpty()) return "" return toUpperCase().first() + drop(1) } Kotlin

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@skentphd Swift extension String { func cap() -> String { guard !isEmpty else { return "" } return String(uppercased().first!) + dropFirst() } } fun String.cap(): String { if (isEmpty()) return "" return toUpperCase().first() + drop(1) } Kotlin

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@skentphd Swift extension String { func cap() -> String { guard !isEmpty else { return "" } return String(uppercased().first!) + dropFirst() } } fun String.cap(): String { if (isEmpty()) return "" return toUpperCase().first() + drop(1) } Kotlin

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@skentphd Swift extension String { func cap() -> String { guard !isEmpty else { return "" } return String(uppercased().first!) + dropFirst() } } "stuart".cap() // "Stuart" fun String.cap(): String { if (isEmpty()) return "" return toUpperCase().first() + drop(1) } "stuart".cap() // "Stuart" Kotlin

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@skentphd Swift class User { // ... func fullName() -> String { return [first, last] .flatMap { $0 } .joined(separator: " ") } } class User { // ... fun fullName(): String { return arrayOf(first, last) .filterNotNull() .joinToString(" ") } } Kotlin

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@skentphd Swift class User { // ... func fullName() -> String { return [first, last] .flatMap { $0 } .joined(separator: " ") } } class User { // ... fun fullName(): String { return arrayOf(first, last) .filterNotNull() .joinToString(" ") } } Kotlin

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@skentphd Swift class User { // ... func fullName() -> String { return [first, last] .flatMap { $0 } .map { $0!.cap() } .joined(separator: " ") } } class User { // ... fun fullName(): String { return arrayOf(first, last) .filterNotNull() .map { it.cap() } .joinToString(" ") } } Kotlin

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@skentphd Swift class User { // ... func fullName() -> String { return [first, last] .flatMap { $0 } .map { $0!.cap() } .joined(separator: " ") } } stuart.fullName() // "Stuart Kent" eminem.fullName() // "Eminem" class User { // ... fun fullName(): String { return arrayOf(first, last) .filterNotNull() .map { it.cap() } .joinToString(" ") } } stuart.fullName() // "Stuart Kent" eminem.fullName() // "Eminem" Kotlin

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@skentphd Swift class User { // ... var reversedName: String { return fullName() .split(separator: " ") .map { String($0) } .reversed() .joined(separator: ", ") } } class User { // ... val reversedName: String get() = fullName() .split(Regex(" ")) // No explicit cast needed. .asReversed() .joinToString(", ") } Kotlin

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@skentphd Swift class User { // ... var reversedName: String { return fullName() .split(separator: " ") .map { String($0) } .reversed() .joined(separator: ", ") } } class User { // ... val reversedName: String get() = fullName() .split(Regex(" ")) // No explicit cast needed. .asReversed() .joinToString(", ") } Kotlin

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@skentphd Swift class User { // ... var reversedName: String { return fullName() .split(separator: " ") .map { String($0) } .reversed() .joined(separator: ", ") } } class User { // ... val reversedName: String get() = fullName() .split(Regex(" ")) // No explicit cast needed. .asReversed() .joinToString(", ") } Kotlin

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@skentphd Swift class User { // ... var reversedName: String { return fullName() .split(separator: " ") .map { String($0) } .reversed() .joined(separator: ", ") } } stuart.reversedName // "Kent, Stuart" eminem.reversedName // "Eminem" class User { // ... val reversedName: String get() = fullName() .split(Regex(" ")) // No explicit cast needed. .asReversed() .joinToString(", ") } stuart.reversedName // "Kent, Stuart" eminem.reversedName // "Eminem" Kotlin

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@skentphd Swift enum Type { case visa case masterCard case discover } enum class Type { VISA, MASTERCARD, DISCOVER } Kotlin

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@skentphd Swift enum Type { case visa case masterCard case discover } func getUrl(t: Type) -> String { switch t { case .visa: return "/visa" case .masterCard: return "/mc" case .discover: return "/disc" // No default case required! } } enum class Type { VISA, MASTERCARD, DISCOVER } fun getUrl(t: Type): String { return when (t) { VISA -> "/visa" MASTERCARD -> "/mc" DISCOVER -> "/disc" // No default case required! } } Kotlin

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@skentphd Swift enum Type { case visa case masterCard case discover } func getUrl(t: Type) -> String { switch t { case .visa: return "/visa" case .masterCard: return "/mc" case .discover: return "/disc" // No default case required! } } enum class Type { VISA, MASTERCARD, DISCOVER } fun getUrl(t: Type): String { return when (t) { VISA -> "/visa" MASTERCARD -> "/mc" DISCOVER -> "/disc" // No default case required! } } Kotlin

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@skentphd Swift enum Type { case visa case masterCard case discover } func getUrl(t: Type) -> String { switch t { case .visa: return "/visa" case .masterCard: return "/mc" case .discover: return "/disc" // No default case required! } } enum class Type { VISA, MASTERCARD, DISCOVER } fun getUrl(t: Type): String { return when (t) { VISA -> "/visa" MASTERCARD -> "/mc" DISCOVER -> "/disc" // No default case required! } } Kotlin

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@skentphd Swift enum Type { case visa case masterCard case discover } func getUrl(t: Type) -> String { switch t { case .visa: return "/visa" case .masterCard: return "/mc" case .discover: return "/disc" // No default case required! } } enum class Type { VISA, MASTERCARD, DISCOVER } fun getUrl(t: Type): String { return when (t) { VISA -> "/visa" MASTERCARD -> "/mc" DISCOVER -> "/disc" // No default case required! } } Kotlin

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@skentphd Swift enum Type { case visa case masterCard case discover } func getUrl(t: Type) -> String { switch t { case .visa: return "/visa" case .masterCard: return "/mc" case .discover: return "/disc" // No default case required! } } enum class Type { VISA, MASTERCARD, DISCOVER } fun getUrl(t: Type): String { return when (t) { VISA -> "/visa" MASTERCARD -> "/mc" DISCOVER -> "/disc" // No default case required! } } Kotlin

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@skentphd Swift enum Type { case visa case masterCard case discover } func getUrl(t: Type) -> String { switch t { case .visa: return "/visa" case .masterCard: return "/mc" case .discover: return "/disc" // No default case required! } } getUrl(t: .discover) // "/disc" enum class Type { VISA, MASTERCARD, DISCOVER } fun getUrl(t: Type): String { return when (t) { VISA -> "/visa" MASTERCARD -> "/mc" DISCOVER -> "/disc" // No default case required! } } getUrl(DISCOVER) // "/disc" Kotlin

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@skentphd Swift enum Method { case cash case card(String) } sealed class Method { class Cash : Method() class Card(val num: String):Method() } Kotlin

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@skentphd Swift enum Method { case cash case card(String) } func getUrl(m: Method) -> String { switch method { case .cash: return "/cash" case .card(let num): return "/card/\(num)" // No default case required! } } sealed class Method { class Cash : Method() class Card(val num: String):Method() } fun getUrl(m: Method): String { return when (method) { is Cash -> "/cash" is Card -> "/card/${method.num}" // No default case required! } } Kotlin

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@skentphd Swift enum Method { case cash case card(String) } func getUrl(m: Method) -> String { switch method { case .cash: return "/cash" case .card(let num): return "/card/\(num)" // No default case required! } } sealed class Method { class Cash : Method() class Card(val num: String):Method() } fun getUrl(m: Method): String { return when (method) { is Cash -> "/cash" is Card -> "/card/${method.num}" // No default case required! } } Kotlin

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@skentphd Swift enum Method { case cash case card(String) } func getUrl(m: Method) -> String { switch method { case .cash: return "/cash" case .card(let num): return "/card/\(num)" // No default case required! } } sealed class Method { class Cash : Method() class Card(val num: String):Method() } fun getUrl(m: Method): String { return when (method) { is Cash -> "/cash" is Card -> "/card/${method.num}" // No default case required! } } Kotlin

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@skentphd Swift enum Method { case cash case card(String) } func getUrl(m: Method) -> String { switch method { case .cash: return "/cash" case .card(let num): return "/card/\(num)" // No default case required! } } sealed class Method { class Cash : Method() class Card(val num: String):Method() } fun getUrl(m: Method): String { return when (method) { is Cash -> "/cash" is Card -> "/card/${method.num}" // No default case required! } } Kotlin

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@skentphd Swift enum Method { case cash case card(String) } func getUrl(m: Method) -> String { switch method { case .cash: return "/cash" case .card(let num): return "/card/\(num)" // No default case required! } } // "/card/1234" getUrl(m: .card("1234")) sealed class Method { class Cash : Method() class Card(val num: String):Method() } fun getUrl(m: Method): String { return when (method) { is Cash -> "/cash" is Card -> "/card/${method.num}" // No default case required! } } // "/card/1234" getUrl(Card("1234")) Kotlin

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@skentphd So far, soooo good...

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@skentphd Swift struct Name { let first: String let last: String? } data class Name( val first: String, val last: String? = null) Kotlin

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@skentphd Swift struct Name { let first: String let last: String? } let stuartName = Name(first: "Stuart", last: "Kent") data class Name( val first: String, val last: String? = null) val stuartName = Name(first="Stuart", last="Kent") Kotlin

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@skentphd Swift struct Name { let first: String let last: String? } let stuartName = Name(first: "Stuart", last: "Kent") let eminemName = Name(first: "Eminem", last: null) data class Name( val first: String, val last: String? = null) val stuartName = Name(first="Stuart", last="Kent") val eminemName = Name(first="Eminem") Kotlin

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@skentphd Swift // Value type struct Name { let first: String let last: String? } let stuartName = Name(first: "Stuart", last: "Kent") let eminemName = Name(first: "Eminem", last: null) // Reference type data class Name( val first: String, val last: String? = null) val stuartName = Name(first="Stuart", last="Kent") val eminemName = Name(first="Eminem") Kotlin

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@skentphd Swift // Value type struct Name { let first: String let last: String? } let stuartName = Name(first: "Stuart", last: "Kent") let eminemName = Name(first: "Eminem", last: null) // Reference type data class Name( val first: String, val last: String? = null) val stuartName = Name(first="Stuart", last="Kent") val eminemName = Name(first="Eminem") val littleStuartName = stuartName.copy(last = "Little") Kotlin

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@skentphd Swift // Value type struct Name { let first: String let last: String? } let stuartName = Name(first: "Stuart", last: "Kent") let eminemName = Name(first: "Eminem", last: null) // Reference type data class Name( val first: String, val last: String? = null) val stuartName = Name(first="Stuart", last="Kent") val eminemName = Name(first="Eminem") val littleStuartName = stuartName.copy(last = "Little") Kotlin

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@skentphd Swift protocol InitialsProvider { func initials() -> String } interface InitialsProvider { fun initials(): String } Kotlin

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@skentphd Swift protocol InitialsProvider { func initials() -> String } class User: InitialsProvider { // ... func initials() -> String { return fullName() .split(separator: " ") .map { String($0.first!) } .joined(separator: "") } } interface InitialsProvider { fun initials(): String } class User : InitialsProvider { // ... override fun initials(): String { return fullName() .split(Regex(" ")) .map { it.first() } .joinToString("") } } Kotlin

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@skentphd Swift protocol InitialsProvider { func initials() -> String } class User: InitialsProvider { // ... func initials() -> String { return fullName() .split(separator: " ") .map { String($0.first!) } .joined(separator: "") } } interface InitialsProvider { fun initials(): String } class User : InitialsProvider { // ... override fun initials(): String { return fullName() .split(Regex(" ")) .map { it.first() } .joinToString("") } } Kotlin

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@skentphd Swift protocol InitialsProvider { func initials() -> String } class User: InitialsProvider { // ... func initials() -> String { return fullName() .split(separator: " ") .map { String($0.first!) } .joined(separator: "") } } interface InitialsProvider { fun initials(): String } class User : InitialsProvider { // ... override fun initials(): String { return fullName() .split(Regex(" ")) .map { it.first() } .joinToString("") } } Kotlin

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@skentphd Swift protocol InitialsProvider { func initials() -> String } class User: InitialsProvider { // ... func initials() -> String { return fullName() .split(separator: " ") .map { String($0.first!) } .joined(separator: "") } } interface InitialsProvider { fun initials(): String } class User : InitialsProvider { // ... override fun initials(): String { return fullName() .split(Regex(" ")) .map { it.first() } .joinToString("") } } Kotlin

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@skentphd Swift protocol InitialsProvider { func initials() -> String } class User: InitialsProvider { // ... func initials() -> String { return fullName() .split(separator: " ") .map { String($0.first!) } .joined(separator: "") } } interface InitialsProvider { fun initials(): String } class User : InitialsProvider { // ... override fun initials(): String { return fullName() .split(Regex(" ")) .map { it.first() } .joinToString("") } } Kotlin

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@skentphd Swift protocol InitialsProvider { func initials() -> String } class User: InitialsProvider { // ... func initials() -> String { return fullName() .split(separator: " ") .map { String($0.first!) } .joined(separator: "") } } stuart.initials() // "SK" eminem.initials() // "E" interface InitialsProvider { fun initials(): String } class User : InitialsProvider { // ... override fun initials(): String { return fullName() .split(Regex(" ")) .map { it.first() } .joinToString("") } } stuart.initials() // "SK" eminem.initials() // "E" Kotlin

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@skentphd Swift protocol InitialsProvider { func initials() -> String } Kotlin

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@skentphd Swift protocol InitialsProvider { func initials() -> String } class User {/**/} Kotlin

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@skentphd Swift protocol InitialsProvider { func initials() -> String } class User {/**/} extension User: InitialsProvider { func initials() -> String {/**/} } Kotlin

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@skentphd Swift protocol InitialsProvider { func initials() -> String } class User {/**/} extension User: InitialsProvider { func initials() -> String {/**/} } Kotlin

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@skentphd Swift protocol InitialsProvider { func initials() -> String } class User {/**/} extension User: InitialsProvider { func initials() -> String {/**/} } Kotlin

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@skentphd Swift protocol InitialsProvider { func initials() -> String } class User {/**/} extension User: InitialsProvider { func initials() -> String {/**/} } stuart is InitialsProvider // true Kotlin

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@skentphd Swift protocol InitialsProvider { func initials() -> String } class User {/**/} extension User: InitialsProvider { func initials() -> String {/**/} } stuart is InitialsProvider // true ⛔ Kotlin

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@skentphd Swift extension ProgressIndicatable where Self: UIViewController {/**/} Kotlin

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@skentphd Swift extension ProgressIndicatable where Self: UIViewController {/**/} extension Stack where Element: Equatable {/**/} Kotlin

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@skentphd Swift extension ProgressIndicatable where Self: UIViewController {/**/} extension Stack where Element: Equatable {/**/} ⛔ Kotlin

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@skentphd Architecture

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@skentphd Shared Architectures • ⛔ Protocol-oriented • ✅ Platform-agnostic: MVP, MVVM, etc.

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@skentphd iOS // Mockable protocol UserView: class { // View updating methods } // Mockable interface UserView { // View updating methods } Android

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@skentphd iOS // Mockable protocol UserView: class { // View updating methods } // (Unit) Testable class UserPresenter { weak var view: UserView init(_ view: UserView) {/**/} func start() {} func stop() {} // Other view update callbacks } // Mockable interface UserView { // View updating methods } // (Unit) Testable class UserPresenter { var view: UserView constructor(view: UserView) {/**/} fun start() {} fun stop() {} // Other view update callbacks } Android

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@skentphd iOS // Mockable protocol UserView: class { // View updating methods } // (Unit) Testable class UserPresenter { weak var view: UserView init(_ view: UserView) {/**/} func start() {} func stop() {} // Other view update callbacks } // Mockable interface UserView { // View updating methods } // (Unit) Testable class UserPresenter { var view: UserView constructor(view: UserView) {/**/} fun start() {} fun stop() {} // Other view update callbacks } Android

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@skentphd iOS // Mockable protocol UserView: class { // View updating methods } // (Unit) Testable class UserPresenter { weak var view: UserView init(_ view: UserView) {/**/} func start() {} func stop() {} // Other view update callbacks } // Mockable interface UserView { // View updating methods } // (Unit) Testable class UserPresenter { var view: UserView constructor(view: UserView) {/**/} fun start() {} fun stop() {} // Other view update callbacks } Android

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@skentphd iOS // Mockable protocol UserView: class { // View updating methods } // (Unit) Testable class UserPresenter { weak var view: UserView init(_ view: UserView) {/**/} func start() {} func stop() {} // Other view update callbacks } // Mockable interface UserView { // View updating methods } // (Unit) Testable class UserPresenter { var view: UserView constructor(view: UserView) {/**/} fun start() {} fun stop() {} // Other view update callbacks } Android

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@skentphd iOS // Mockable protocol UserView: class { // View updating methods } // (Unit) Testable class UserPresenter { weak var view: UserView init(_ view: UserView) {/**/} func start() {} func stop() {} // Other view update callbacks } // Mockable interface UserView { // View updating methods } // (Unit) Testable class UserPresenter { var view: UserView constructor(view: UserView) {/**/} fun start() {} fun stop() {} // Other view update callbacks } Android

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@skentphd iOS class UserVC: UIViewController, UserView { var userPresenter: UserPresenter? override func viewDidLoad() { super.viewDidLoad() userPresenter = UserPresenter(self) } override func viewWillAppear(/**/) { super.viewWillAppear(/**/) userPresenter?.start() } override func viewWillDisappear(/**/) { userPresenter?.stop() super.viewWillDisappear(/**/) } } class UserActivity: Activity(), UserView { var userPresenter: UserPresenter? = null override fun onCreate(/**/) { super.onCreate(/**/) userPresenter = UserPresenter(this) } override fun onStart() { super.onStart() userPresenter?.start() } override fun onStop() { userPresenter?.stop() super.onStop() } } Android

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@skentphd iOS class UserVC: UIViewController, UserView { var userPresenter: UserPresenter? override func viewDidLoad() { super.viewDidLoad() userPresenter = UserPresenter(self) } override func viewWillAppear(/**/) { super.viewWillAppear(/**/) userPresenter?.start() } override func viewWillDisappear(/**/) { userPresenter?.stop() super.viewWillDisappear(/**/) } } class UserActivity: Activity(), UserView { var userPresenter: UserPresenter? = null override fun onCreate(/**/) { super.onCreate(/**/) userPresenter = UserPresenter(this) } override fun onStart() { super.onStart() userPresenter?.start() } override fun onStop() { userPresenter?.stop() super.onStop() } } Android

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@skentphd iOS class UserVC: UIViewController, UserView { var userPresenter: UserPresenter? override func viewDidLoad() { super.viewDidLoad() userPresenter = UserPresenter(self) } override func viewWillAppear(/**/) { super.viewWillAppear(/**/) userPresenter?.start() } override func viewWillDisappear(/**/) { userPresenter?.stop() super.viewWillDisappear(/**/) } } class UserActivity: Activity(), UserView { var userPresenter: UserPresenter? = null override fun onCreate(/**/) { super.onCreate(/**/) userPresenter = UserPresenter(this) } override fun onStart() { super.onStart() userPresenter?.start() } override fun onStop() { userPresenter?.stop() super.onStop() } } Android

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@skentphd iOS class UserVC: UIViewController, UserView { var userPresenter: UserPresenter? override func viewDidLoad() { super.viewDidLoad() userPresenter = UserPresenter(self) } override func viewWillAppear(/**/) { super.viewWillAppear(/**/) userPresenter?.start() } override func viewWillDisappear(/**/) { userPresenter?.stop() super.viewWillDisappear(/**/) } } class UserActivity: Activity(), UserView { var userPresenter: UserPresenter? = null override fun onCreate(/**/) { super.onCreate(/**/) userPresenter = UserPresenter(this) } override fun onStart() { super.onStart() userPresenter?.start() } override fun onStop() { userPresenter?.stop() super.onStop() } } Android

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@skentphd iOS class UserVC: UIViewController, UserView { var userPresenter: UserPresenter? override func viewDidLoad() { super.viewDidLoad() userPresenter = UserPresenter(self) } override func viewWillAppear(/**/) { super.viewWillAppear(/**/) userPresenter?.start() } override func viewWillDisappear(/**/) { userPresenter?.stop() super.viewWillDisappear(/**/) } } class UserActivity: Activity(), UserView { var userPresenter: UserPresenter? = null override fun onCreate(/**/) { super.onCreate(/**/) userPresenter = UserPresenter(this) } override fun onStart() { super.onStart() userPresenter?.start() } override fun onStop() { userPresenter?.stop() super.onStop() } } Android

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@skentphd iOS class UserVC: UIViewController, UserView { var userPresenter: UserPresenter? override func viewDidLoad() { super.viewDidLoad() userPresenter = UserPresenter(self) } override func viewWillAppear(/**/) { super.viewWillAppear(/**/) userPresenter?.start() } override func viewWillDisappear(/**/) { userPresenter?.stop() super.viewWillDisappear(/**/) } } class UserActivity: Activity(), UserView { var userPresenter: UserPresenter? = null override fun onCreate(/**/) { super.onCreate(/**/) userPresenter = UserPresenter(this) } override fun onStart() { super.onStart() userPresenter?.start() } override fun onStop() { userPresenter?.stop() super.onStop() } } Android

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@skentphd iOS class UserVC: UIViewController, UserView { var userPresenter: UserPresenter? override func viewDidLoad() { super.viewDidLoad() userPresenter = UserPresenter(self) } override func viewWillAppear(/**/) { super.viewWillAppear(/**/) userPresenter?.start() } override func viewWillDisappear(/**/) { userPresenter?.stop() super.viewWillDisappear(/**/) } } class UserActivity: Activity(), UserView { var userPresenter: UserPresenter? = null override fun onCreate(/**/) { super.onCreate(/**/) userPresenter = UserPresenter(this) } override fun onStart() { super.onStart() userPresenter?.start() } override fun onStop() { userPresenter?.stop() super.onStop() } } Android

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@skentphd Layouts

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@skentphd 2008 iPhone iOS

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@skentphd 2008 iPhone 2010 iPad iOS

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@skentphd 2008 iPhone 2010 iPad 2012 iPhone 5; iPad mini; AutoLayout iOS

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@skentphd 2008 iPhone 2010 iPad 2012 iPhone 5; iPad mini; AutoLayout 2014 iPhone 6; iPhone 6 Plus iOS

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@skentphd 2008 iPhone 2010 iPad 2012 iPhone 5; iPad mini; AutoLayout 2014 iPhone 6; iPhone 6 Plus 2015 UIStackView iOS

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@skentphd 2009 Android 1.0 (internal) Android

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@skentphd 2009 Android 1.0 (internal) 2009 AbsoluteLayout replaced by LinearLayout, RelativeLayout Android

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@skentphd 2009 Android 1.0 (internal) 2009 AbsoluteLayout replaced by LinearLayout, RelativeLayout 2009 Android 1.6 (public) Android

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@skentphd 2009 Android 1.0 (internal) 2009 AbsoluteLayout replaced by LinearLayout, RelativeLayout 2009 Android 1.6 (public) 2017 ConstraintLayout released Android

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@skentphd iOS vs Android Similarities: • Precise → adaptive • General, performant option • Specialized, maintainable option(s)

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@skentphd AutoLayout vs ConstraintLayout Similarities: • Powerful • Design via GUI • Based on Cassowary algorithm • Simple slick animations

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@skentphd AutoLayout vs ConstraintLayout Differences: • Default behaviors • Fallback handling

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@skentphd UIStackView vs LinearLayout Similarities: • Maintainable • Orientation control • Graceful dynamic behaviors

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@skentphd UIStackView vs LinearLayout Differences: • Weighting

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@skentphd Use AutoLayout* or ConstraintLayout when #PerfMatters. Use UIStackView or LinearLayout when #SanityMatters.

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@skentphd

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@skentphd

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@skentphd

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@skentphd

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@skentphd Resources & Tactics

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@skentphd Resources • http://nilhcem.com/swift-is-like-kotlin/

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@skentphd Resources • http://nilhcem.com/swift-is-like-kotlin/ • https://kotlinlang.org/docs/tutorials/getting-started.html

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@skentphd Resources • http://nilhcem.com/swift-is-like-kotlin/ • https://kotlinlang.org/docs/tutorials/getting-started.html • https://kotlinlang.org/docs/tutorials/koans.html

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@skentphd Resources • http://nilhcem.com/swift-is-like-kotlin/ • https://kotlinlang.org/docs/tutorials/getting-started.html • https://kotlinlang.org/docs/tutorials/koans.html • https://kotlinlang.org/docs/tutorials/kotlin-android.html

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@skentphd Tactics • Ride the wave

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@skentphd Tactics • Ride the wave • Read Android PRs; ask questions

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@skentphd Tactics • Ride the wave • Read Android PRs; ask questions • Build a small Android app

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@skentphd Tactics • Ride the wave • Read Android PRs; ask questions • Build a small Android app • Use IntelliJ's auto-conversion to turn Java/ Android code samples into Kotlin.

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@skentphd Q&A