how to remove item from array list in kotlin

Question

data class RideDate(var enddate: String? = null,var startdate: String? = null) 



 fun main(args: Array<String>) {
var listOfRideDate = mutableListOf<RideDate>();
val date1 = RideDate()
date1.startdate = "2018-11-05 00:00:00 +0000"
date1.enddate = "2018-11-06 23:59:59 +0000"
listOfRideDate.add(date1)

val date2 = RideDate()
date2.startdate = "2020-01-20 00:00:00 +0000"
date2.enddate = "2020-02-20 00:00:00 +0000"
listOfRideDate.add(date2)

val date3 = RideDate()
date3.startdate = "2020-03-20 00:00:00 +0000"
date3.enddate = "2020-03-20 00:00:00 +0000"
listOfRideDate.add(date3)

val date4 = RideDate()
date4.startdate = "2020-04-20 00:00:00 +0000"
date4.enddate = "2020-04-20 00:00:00 +0000"
listOfRideDate.add(date4)

val date5 = RideDate()
date5.startdate = "2020-11-20 00:00:00 +0000"
date5.enddate = "2020-11-20 00:00:00 +0000"
listOfRideDate.add(date5)


for (i in 0..listOfRideDate.size -1) {
    // we have to remove 2018-11-05 00:00:00 +0000 and 2018-11-06 23:59:59 +0000  from list 
    println(listOfRideDate.get(i).startdate + " and " + listOfRideDate.get(i).enddate)
}

}

This is my data class and the main method I have added item RideDate of startDate and endDate manually I want delete item dynamically if data contains date1.startdate = "2018-11-05 00:00:00 +0000" date1.enddate = "2018-11-06 23:59:59 +0000"

so that I can ignore it please help me how to delete the item from array list in kotlin

Answer 1

You can use removeAll to remove element from original list if it matches the predicate.

listOfRideDate.removeAll {
    it.startdate == "2018-11-05 00:00:00 +0000" && it.enddate == "2018-11-06 23:59:59 +0000"
}

Or you can filter by creating a new list with filtered items as suggested by Johann Kexel

val filtertedList = listOfRideDate.filter {
    it.startdate == "2018-11-05 00:00:00 +0000" && it.enddate == "2018-11-06 23:59:59 +0000"
}

Answer 2

You can use filter in your case

val filtertedList = listOfRideDate.filter { element -> someLogik(element)}

Refer also to the following page

Filtering Kotlinlang

Answer 3

Like this:

loop@ for (i in 0 until listOfRideDate.size) {
        // we have to remove 2018-11-05 00:00:00 +0000 and 2018-11-06 23:59:59 +0000  from list
        if (listOfRideDate.get(i).startdate == "2018-11-05 00:00:00 +0000" &&  listOfRideDate.get(i).enddate == "2018-11-06 23:59:59 +0000"){
            listOfRideDate.removeAt(i)
            break@loop
        }
    }

or

listOfRideDate.removeIf {
     it.startdate == "2018-11-05 00:00:00 +0000" &&  it.enddate == "2018-11-06 23:59:59 +0000"
}