RemoveAt not found in list kotlin?

Question

I have a list whose value is filled from API

var dataList: List<Data?>? = null

I need to remove the element from 0th index

while in java I could use

dataList.removeAt(0)

But I don't see the function in kotlin

can you please show us some data in your list? and how you fill the list — Youcef LAIDANI, Jun 08 '20 at 07:33
same question: https://stackoverflow.com/questions/37913252/kotlins-list-missing-add-remove-map-missing-put-etc — shingo.nakanishi, Jun 08 '20 at 07:35

score 4 · Accepted Answer · answered Jun 08 '20 at 07:36

4

List supports only read-only access while MutableList supports adding and removing elements.

so var dataList: MutableList<Data?>? = null will give you the option to remove an element.

answered Jun 08 '20 at 07:36

Ben Shmuel

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score 2 · Answer 2 · answered Jun 08 '20 at 07:36

This is because unlike java List is immutable in Kotlin. That means you can't modify after declaring it. To get functionalities like add,remove you can declare a mutable list in Kotlin like this:

val mutableList = mutableListOf<String>()
mutableList.add("Some data")
mutableList.removeAt(0)

score 1 · Answer 3 · answered Jun 08 '20 at 07:37

You can't remove an item from a List. Nor can you add an item, nor change one. That's because List is a read-only interface!

If the list is mutable, you could instead have a MutableList reference to it. MutableList is a subinterface that adds all the methods for adding, changing, and removing items.

RemoveAt not found in list kotlin?

3 Answers3