고계함수

Tutorial/Tutorial.playground/Contents.swift

@@ -28,5 +28,62 @@ let champs = try JSONSerialization.jsonObject(with: champsData!, options: [])
 let selectedIndexes = try JSONSerialization.jsonObject(with: selectedIndexesData!, options: [])
 
 // TODO: selectedIndexes는 챔피언 목록(champs)의 key 번호 들이다. selectedIndexes에 명시된 순서대로 챔피언들의 이름(name)을 나열하라
-let names: [String] = []
+var names: [String] = []
+
+struct Chmaps {
+    let key: String
+    let name: String
+
+    init(json: [String: Any]) {
+        key = json["key"] as? String ?? ""
+        name = json["name"] as? String ?? ""
+
+    }
+}
+
+let champArr = champs as! [Any]
+let champsDatas = champArr.map{Chmaps(json: $0 as! [String : Any])}
+
+let selectedIndexesArr = selectedIndexes as! [Int]
+print(selectedIndexesArr)
+
+//forEach, filter, first/last(where:), reduce
+//map, flatMap, compactMap
+
+// MARK: 실습
+
+selectedIndexesArr.forEach { (key) in
+    let filteringChamps = champsDatas.filter({ (champ) -> Bool in
+        let result = champ.key == String(key)
+        return result
+    })
+    filteringChamps.forEach{names.append($0.name)}
+
+
+}
 print(names)
+
+
+// MARK: 실습1. 고계함수 활용
+//forEach, filter, first/last(where:), reduce
+//map, flatMap, compactMap
+
+let result = selectedIndexesArr.map { (key) -> String in
+    champsDatas.first { (champ) -> Bool in
+       return champ.key == String(key)
+        }.map{$0.name} ?? ""
+}
+
+print(result)
+
+
+
+
+
+
+
+
+
+
+
+