"What's new in Swift"の要約 / swift_5_7_summary

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8IBUTOFXJO4XJGUͷ
ཁ໿💡

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΢ϗʔΠ
J04ΞϓϦΤϯδχΞ
w ͱ͖Ͳ͖4XJGUѪ޷ձͷ
 
ӡӦʹࢀՃ͍ͯ͠Δ
w ೥࿈ଓճ໨
w ݄ʹస৬ͨ͠

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ͷ৽ػೳʢશൠɾδΣωϦΫεʣʹ͍ͭͯ࿩͠·͢
4XJGU

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શൠ

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4&
JGMFUߏจΛলུͯ͠ॻ͚Δ
let foo: Int? = 0

let bar: String? = "bar"

// Swift 5.6

if let foo = foo { ... }

guard let bar = bar else { ... }

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4&
JGMFUߏจΛলུͯ͠ॻ͚Δ
let foo: Int? = 0

let bar: String? = "bar"

// Swift 5.7

if let foo { ... }

guard let bar else { ... }

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4&
Ϋϩʔδϟ಺͕ෳ਺ͷจͰ΋ɺҾ਺ͱ໭Γ஋ͷܕΛলུͰ͖Δ
func map(fn: (Int) -> T) -> T {

fn(42)

}

// Swift 5.6

_ = map { value -> Double in

print("Foo")

return Double(value)

}

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4&
Ϋϩʔδϟ಺͕ෳ਺ͷจͰ΋ɺҾ਺ͱ໭Γ஋ͷܕΛলུͰ͖Δ
func map(fn: (Int) -> T) -> T {

fn(42)

}

// Swift 5.7

_ = map {

print("Foo")

return Double(value)

}

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δΣωϦΫε

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4&
δΣωϦοΫؔ਺ͷҾ਺ʹσϑΥϧτ஋ΛࢦఆͰ͖Δ
struct Foo: Equatable {

static let shared = Foo()

}

// Swift 5.6

final class Bar {

private let foo: F

init(foo: F) {

self.foo = foo

}

convenience init() where F == Foo {

self.init(foo: .shared)

}

}

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4&
δΣωϦοΫؔ਺ͷҾ਺ʹσϑΥϧτ஋ΛࢦఆͰ͖Δ
struct Foo: Equatable {

static let shared = Foo()

}

// Swift 5.7

final class Bar {

private let foo: F

init(foo: F = Foo.shared) {

self.foo = foo

}

}

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4&
࿈૝ܕΛ࣋ͭϓϩτίϧΛܕͱͯ͠࢖͑Δ
// Swift 5.6

protocol Foo {}

protocol Bar {

associatedtype FooType: Foo

func foo() -> FooType

}

struct FooStruct: Foo {}

struct BarStruct: Bar {

func foo() -> FooStruct {

.init()

}

}
struct AnyBar {

private let _foo: () -> B.FooType

init(_ base: B) {

_foo = { base.foo() }

}

}

extension AnyBar: Bar {

func foo() -> B.FooType {

_foo()

}

}

let bar: AnyBar = .init(BarStruct())

_ = bar.foo()

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4&
࿈૝ܕΛ࣋ͭϓϩτίϧΛܕͱͯ͠࢖͑Δ
let bar: any Bar = BarStruct()

_ = bar.foo()
// Swift 5.7

protocol Foo {}

protocol Bar {

associatedtype FooType: Foo

func foo() -> FooType

}

struct FooStruct: Foo {}

struct BarStruct: Bar {

func foo() -> FooStruct {

.init()

}

}

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4&
ؔ਺ͷҾ਺ʹsome͕࢖͑Δ
// Swift 5.6

func foo(_ v1: V1, _ v2: V2) ->

some View {

// ...

}

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4&
ؔ਺ͷҾ਺ʹsome͕࢖͑Δ
// Swift 5.7

func foo(_ v1: some View, _ v2: some View) ->

some View {

// ...

}

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4&
ϓϩτίϧʹࢁΧοίͰؔ࿈ܕΛॻ͚Δ
// Swift 5.6

protocol Graph {

associatedtype Foo

associatedtype Bar

}

struct GraphStruct: Graph {

typealias Foo = Int

typealias Bar = String

}
protocol TestProtocol {

func bar(_: G, foo: F) -> [B]
where G: Graph, G.Foo == F, G.Bar == B

}

extension Graph where Foo == Int, Bar ==
String {

// ...

}

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4&
ϓϩτίϧʹࢁΧοίͰؔ࿈ܕΛॻ͚Δ
// Swift 5.7

protocol Graph {

associatedtype Foo

associatedtype Bar

}

struct GraphStruct: Graph {

typealias Foo = Int

typealias Bar = String

}
protocol TestProtocol {

func bar(_: some Graph,
foo: F) -> [B]

}

extension Graph {

// ...

}

final class Test {

// Swift 5.6 Ͱ͸࣮ݱͰ͖ͳ͍

func build() -> some Graph
{

GraphStruct()

}

}

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·ͱΊ
w ίʔυͷهड़ྔ͕ݮΔݴޠ࢓༷͕૿͑ͨ
w δΣωϦΫε͕ڧԽ͞ΕɺΑΓ௚ײతʹهड़Ͱ͖ΔΑ͏ʹͳͬͨ
w someͱanyΛ࢖͏ͱಡΈ΍͍͢

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"What's new in Swift"の要約 / swift_5_7_summary

"What's new in Swift"の要約 / swift_5_7_summary

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