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Collections: Associating the data using some key
Devrath edited this page Feb 29, 2024
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1 revision
Observation
- The advantage here is observe we were able to convert the list of objects into a map by using one of the fields of the objects in the list of each item.
- Also notice I had duplicate entry as key that was removed from output
Code
data class Country(val id : Int, val name: String, val isDemocracy: Boolean)
val countriesList = mutableListOf(
Country(id = 1, name = "USA", isDemocracy = true),
Country(id = 2, name = "Australia", isDemocracy = true),
Country(id = 3, name = "Russia", isDemocracy = false),
Country(id = 4, name = "England", isDemocracy = true),
Country(id = 5, name = "North Korea", isDemocracy = false),
Country(id = 5, name = "South Korea", isDemocracy = false)
)
fun main(args: Array<String>) {
val mapOfObjects = countriesList.associateBy {
it.id
}
mapOfObjects.forEach{
println(it.value.name)
}
}
Output
USA
Australia
Russia
England
South Korea