Finished source code for advanced dictionary

Author: Bob Lee

course/.DS_Store

@@ -2,53 +2,53 @@
 
 ## Introduction
 ## Problem
+Can subscripts return `T`?
 
+### Your past
 ```swift
-struct JSON {
- fileprivate var 스토리지: [String:Any]
+struct WeekDays {
+ private var days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"]
 
- init(dictionary: [String:Any]) {
- self.스토리지 = dictionary
+ subscript(index: Int) -> String {
+ return days[index]
  }
 
- subscript<T>(key: String) -> T? {
- return 스토리지[key] as? T
- }
 }
 ```
 
-
+### Introducing Generic Subscripts
 ```swift
-let 한국데이터 = JSON(dictionary: [
- "수도": "서울",
- "나라": "대한민국",
- "인구": 50,000,000
- ])
-
-let 대한민국인구: struct JSON {
- fileprivate var 스토리지: [String:Any]
+struct JSON {
+ private var storage: [String: Any]
 
- init(dictionary: [String:Any]) {
- self.스토리지 = dictionary
+ init(dictionary: [String: Any]) {
+ self.storage = dictionary
  }
 
  subscript<T>(key: String) -> T? {
- return 스토리지[key] as? T
+ return storage[key] as? T
  }
 }
+```
 
-let json = JSON(dictionary: [
- "수도": "서울",
- "나라": "대한민국",
- "인구": 50_000_000
+### Create JSON
+```swift
+let republicOfKorea = JSON(dictionary: [
+ "capital": "Seoul",
+ "name": "Republic of Korea",
+ "population": 50000000
  ])
+```
 
-// No need to use as? Int
-let 대한민국인구: Int? = 한국데이터["인구"]
-let 대한민국수도: String? = 한국데이터["수도"]
+### Access Value
+```swift
+let koreaCaital: String? = republicOfKorea["capital"]
+let koreaName: String? = republicOfKorea["name"]
+let koreaPopulation: Int? = republicOfKorea["population"]
 ```
 
 
+
 ### Source Code
 ### Resources
 

course/swift4/generic-subscripts.md

@@ -1,2 +1,2 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<playground version='6.0' target-platform='ios' display-mode='raw'/>
+<playground version='6.0' target-platform='ios' display-mode='rendered'/>