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import SwiftUI

struct Response: Codable {
    var results: [Result]
}

struct Result: Codable {
    var trackId: Int
    var trackName: String
    var collectionName: String

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// userColorRepositoryを使うクラス。

class ColorChange(private val repo: UserColorRepositoryInterface) {
    
    //...
    
    val userColor = repo.getUserColor(username = currentUsername)
    
    if (usercolor == Color.White) {
        repo.setUserColor(username = currentUsername, color = Color.Red)

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val userColor = UserColorSingleton.getuserColor(username = currentUserName)

if (userColor == Color.White) {
    UserColorSingleton.setUserColor(username = currentUserName, color = Color.Red)
}

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object UserColorSingleton {

    private val userColorMap: MutableMap<String, Int> = mutableMapOf()

    fun setUserColor(username: String, color: Int) {
        userColorMap[username] = color
    }

    fun getUserColor(username: String): Int {
        return userColorMap.getOrDefault(username, Color.White)

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private var _table: Map<String, Int>? = null
public val table: Map<String, Int>
  get() {
    if (_table == null) {
      _table = HashMap()
    }
      return _table ?: throw AssertionError("他のスレッドによってnullにセットされました。")
  }

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val isEmpty: Boolean
  get() = this.size == 0

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var doubledNumber: Int = 0
  get() = doubledNumber
    set(value) {
      this.doubledNumber = value * 2
    }
  }

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var doubledNumber: Int = 0
  get() = field
  set(value) {
    field = value * 2
  }