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Scala で case class を使った場合の、デフォルトパラメータが必要な時のBuilder Patternサンプル
case class NutritionFacts(
servingSize: Int,
servings: Int,
calories: Int = 0,
fat: Int = 0,
sodium: Int = 0,
carbohydrate: Int = 0
val nf = NutritionFacts(1, 1, fat = 10)
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