Effective Enums in Kotlin with reverse lookup?

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First of all, the argument of fromInt() should be an Int, not an Int?. Trying to get a Type using null will obviously lead to null, and a caller shouldn’t even try doing that. The Map has also no reason to be mutable. The code can be reduced to:

companion object {
    private val map = Type.values().associateBy(Type::value)
    fun fromInt(type: Int) = map[type]
}

That code is so short that, frankly, I’m not sure it’s worth trying to find a reusable solution.

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