Software And Architecture

Collections This post provides some of the operations that can be done in the collections using kotlin The below is the base type definitions that will be used in the below collection queries data class Shop ( val name : String , val customers : List < Customer >) data class Customer ( val name : String , val city : City , val orders : List < Order >) { override fun toString () = " $ name from ${ city . name } " } data class Order ( val products : List < Product >, val isDelivered : Boolean ) data class Product ( val name : String , val price : Double ) { override fun toString () = "' $ name ' for $ price " } data class City ( val name : String ) { override fun toString () = name } Operations on collections // Return a list of customers, sorted in the descending by number of orders they have made fun Shop. getCustomersSortedByOrders (): List<Customer> = this .customers.sortedByDescending( { it -> it.order