Kotlin メモ : firstOrNull()

Java public enum Fruit { APPLE(0), BANANA(1), PEACH(2), ORANGE(3); private final int value; Fruit(int value) { this.value = value; } @NonNull public static Fruit find(int value) { for (Fruit fruit : values()) { if (fruit.value == value) { return fruit; } } return APPLE; } } Kotlin 変換直後 enum class Fruit(private val value: Int) { APPLE(0), BANANA(1), PEACH(2), ORANGE(3); companion object { @JvmStatic fun find(value: Int): Fruit { for (fruit in values()) { if (fruit.value == value) { return fruit } } return APPLE } } } Kotlin with firstOrNull() enum class Fruit(private val value: Int) { APPLE(0), BANANA(1), PEACH(2), ORANGE(3); companion object { @JvmStatic fun find(value: Int): Fruit { return values().firstOrNull { it.value == value } ?: APPLE } } }