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Commit a02afe4

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author
Bob Lee
committed
Finished source code for advanced dictionary
1 parent 4719509 commit a02afe4

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-80
lines changed

21 files changed

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‎course/.DS_Store‎

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‎course/swift4/generic-subscripts.md‎

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## Introduction
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## Problem
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Can subscripts return `T`?
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### Your past
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```swift
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struct JSON {
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fileprivate var 스토리지: [String:Any]
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struct WeekDays {
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private var days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"]
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init(dictionary: [String:Any]) {
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self.스토리지= dictionary
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subscript(index: Int) ->String {
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return days[index]
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}
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subscript<T>(key: String) -> T? {
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return 스토리지[key] as? T
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}
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}
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```
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### Introducing Generic Subscripts
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```swift
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let 한국데이터 = JSON(dictionary: [
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"수도": "서울",
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"나라": "대한민국",
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"인구": 50,000,000
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])
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let 대한민국인구: struct JSON {
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fileprivate var 스토리지: [String:Any]
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struct JSON {
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private var storage: [String: Any]
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init(dictionary: [String:Any]) {
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self.스토리지 = dictionary
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init(dictionary: [String:Any]) {
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self.storage = dictionary
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}
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subscript<T>(key: String) -> T? {
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return 스토리지[key] as? T
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return storage[key] as? T
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}
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}
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```
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let json = JSON(dictionary: [
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"수도": "서울",
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"나라": "대한민국",
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"인구": 50_000_000
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### Create JSON
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```swift
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let republicOfKorea = JSON(dictionary: [
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"capital": "Seoul",
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"name": "Republic of Korea",
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"population": 50000000
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])
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```
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// No need to use as? Int
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let 대한민국인구: Int? = 한국데이터["인구"]
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let 대한민국수도: String? = 한국데이터["수도"]
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### Access Value
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```swift
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let koreaCaital: String? = republicOfKorea["capital"]
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let koreaName: String? = republicOfKorea["name"]
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let koreaPopulation: Int? = republicOfKorea["population"]
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```
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### Source Code
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### Resources
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‎source-code/.DS_Store‎

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‎source-code/10000_advanced-swift/10006_associated_type_constraints.playground/Pages/8001_nested_generics_recursive_enum.xcplaygroundpage/Contents.swift‎

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‎source-code/9000_swift4/.DS_Store‎

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<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
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<playground version='6.0' target-platform='ios' display-mode='raw'/>
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<playground version='6.0' target-platform='ios' display-mode='rendered'/>

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