how to find an index in Arraylist of custom object based on its specific properties in Kotlin?

Question

I have an arraylist of event

var approvedEvents = ArrayList<Event>()

the class of Event is like this

class Event() {

    var eventID : String = ""
    var createdBy: String = "" // uid of user creator
    var creatorFullName: String = ""
    var creatorIsVerified : Boolean = false
    var creatorProfilePictureImagePath = ""
    var createdAt : Date = Calendar.getInstance().time
    var hasBeenApproved : Boolean = false
    var title : String = ""
    var speaker : String? = null
    var coordinate : GeoPoint = City.defaultCityCoordinate
    var address : String = ""
    var city : String = ""
    var venue : String = ""

}

so I want to find an index in approvedEvents arraylist that its eventID match selectedEvent.eventID how to do that in Kotlin ? is there specific method that I can use ?

Answer 1

Use indexOfFirst or indexOfLast to find the index of an item in an ArrayList based on your own criteria like below:

val index = approvedEvents.indexOfFirst{
        it.eventID == selectedEvent.eventID
    }