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끝까지해서 되긴했는데 맞는건가요... #39

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끝까지해서 되긴했는데 맞는건가요... #39

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36 changes: 35 additions & 1 deletion Tutorial/Tutorial.playground/Contents.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -28,5 +28,39 @@ 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] = []
print(names)

struct Champ: Codable{
let key: String
let name: String
}

let champArr = try JSONDecoder().decode([Champ].self, from: champsData!)
let select = try JSONDecoder().decode([Int].self, from: selectedIndexesData!)

//["Tryndamere", "Udyr", "Ahri", "Vayne", "Pyke"]
select.forEach{ index in
champArr
.filter{ "\(index)" == $0.key }
.compactMap{ names.append($0.name) }
}

/*
select.compactMap{ key in
champArr
.first{ $0.key == "\(key)" }
.flatMap{ names.append($0.name) }
}
*/
//위와같은 상황일경우 forEach와 compactMap의 동작은 같은가 성능은 어느것이 좋은가?

//아래같은경우는 select순서대로 검색불가
champArr.compactMap{ champ in
select.filter{ champ.key == "\($0)" }.map{ _ in
names.append( champ.name ) }
}



print(names)