Kotlin Singleton With Parameter

@Volatile private var adapter: JsonAdapter<RateAppReminder>? = nullprivate fun getJsonAdapter(moshi: Moshi): JsonAdapter<RateAppReminder> = adapter ?: synchronized(this) {    moshi.adapter<RateAppReminder>(RateAppReminder::class.java)}

NOTE: Refer to this example for optional parameter.

If no parameter is required, consider using lazy property.

val moshiStringListAdapter by lazy {    moshi.adapter<MutableList<String>>(List::class.java)}

NOTE: To use lazy property with parameter, do look into this.