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struct Me {
let name = “Yosuke Tamaoki”
let age = 31
let company = “Summer" + “Freelance“
let os = "iOS" + "Android"
let hobby = "Splatoon2" + “Poker"
struct Language {
let swift
let objective-c
let java
let kotlin
}
}
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// Dictionary
let classRoom: [String: Any] = [
"teacher": "Yamada",
“studentNum”: 30
]
// before
let teacher = classRoom["teacher"] // "Yamada"
let count = classRoom["studentNum"] // 30
let teacher = classRoom.teacher // compile error
let count = classRoom.studentNum // compile error
// after
let teacher = classRoom.teacher // "Yamada"
let count = classRoom.studentNum // 30
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$MBTTDBTF
@dynamicMemberLookup
class User {
let firstName: String
let lastName: String
let age: Int
init(firstName: String, lastName: String, age: Int) {
self.firstName = firstName
self.lastName = lastName
self.age = age
}
subscript(dynamicMember key: String) -> Any {
switch key {
case "upperFirstName":
return firstName.uppercased()
case "upperLastName":
return lastName.uppercased()
case "adalt":
return 30
case "children":
return 15
default:
return ""
}
}
}
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$MBTTDBTF
@dynamicMemberLookup
class User {
let firstName: String
let lastName: String
let age: Int
init(firstName: String, lastName: String, age: Int) {
self.firstName = firstName
self.lastName = lastName
self.age = age
}
subscript(dynamicMember key: String) -> Any {
switch key {
case "upperFirstName":
return firstName.uppercased()
case "upperLastName":
return lastName.uppercased()
case "adalt":
return 30
case "children":
return 15
default:
return ""
}
}
}
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6TFDBTF
let hanakoYamada = User(firstName: "Hanako",
lastName: "Yamada",
age: 20)
print(hanakoYamada.firstName) // "Hanako"
print(hanakoYamada.lastName) // "Yamada"
print(hanakoYamada.age) // 20
print(hanakoYamada.upperFirstName) // "HANAKO"
print(hanakoYamada.upperLastName) // "YAMADA"
print(hanakoYamada.adalt) // 30
print(hanakoYamada.children) // 15
print(hanakoYamada.young) // ""
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TUSVDUDBTF
@dynamicMemberLookup
struct Person {
subscript(dynamicMember name: String) -> String {
return "Hello, \(name)"
}
}
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TUSVDUDBTF
@dynamicMemberLookup
struct Person {
subscript(dynamicMember name: String) -> String {
return "Hello, \(name)"
}
}
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6TFDBTF
let person = Person()
print(person.swift) // "Hello, swift”
print(person.hanako) // "Hello, hanako”
print(person.taro) // "Hello, taro"
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https://blog.tamappe.com
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1SPUPDPMDBTF
@dynamicMemberLookup
protocol SampleProtocol {
associatedtype Key
associatedtype Value
subscript(key: Key) -> Value? { get }
}
extension SampleProtocol where Key == String {
subscript(dynamicMember member: String) -> Value? {
return self[member]
}
}
extension Dictionary: SampleProtocol {}
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6TFDBTF
let hanakoDic: [String : Any] = [
"firstName": "hanako",
"lastName": "yamada",
"age": 20
]
print(hanakoDic.firstName as! String) // “hanako"
print(hanakoDic.age as! Int) // 20
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&OVNDBTF
@dynamicMemberLookup
enum JSON {
case number(Int)
case string(String)
case array([JSON])
case dictionary([String: JSON])
subscript(dynamicMember key: String) -> JSON? {
guard case .dictionary(let dict) = self else {
return nil
}
return dict[key]
}
}
extension JSON {
var numberValue: Int? {
guard case .number(let n) = self else {
return nil
}
return n
}
var stringValue: String? {
guard case .string(let s) = self else {
return nil
}
return s
}
subscript(index: Int) -> JSON? {
guard case .array(let arr) = self,
arr.indices.contains(index) else
{
return nil
}
return arr[index]
}
subscript(key: String) -> JSON? {
guard case .dictionary(let dict) = self else {
return nil
}
return dict[key]
}
}
+40/
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&OVNDBTF
@dynamicMemberLookup
enum JSON {
case number(Int)
case string(String)
case array([JSON])
case dictionary([String: JSON])
subscript(dynamicMember key: String) -> JSON? {
guard case .dictionary(let dict) = self else {
return nil
}
return dict[key]
}
}
+40/
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&OVNDBTF
extension JSON {
var numberValue: Int? {
guard case .number(let n) = self else {
return nil
}
return n
}
var stringValue: String? {
guard case .string(let s) = self else {
return nil
}
return s
}
subscript(index: Int) -> JSON? {
guard case .array(let arr) = self,
arr.indices.contains(index) else
{
return nil
}
return arr[index]
}
subscript(key: String) -> JSON? {
guard case .dictionary(let dict) = self else {
return nil
}
return dict[key]
}
}
+40/
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6TFDBTF
let json = JSON.dictionary([
"firstName": .string("hanako"),
"lastName": .string("Yamada"),
"age": .number(20),
"language": .array([
.string(“Swift"),
.string("Objective-c"),
.string("Kotlin"),
.string("Java"),
])
])
if let firstName = json.firstName?.stringValue {
print(firstName) // "hanako"
}