If the item does not exist in the list, it will return -1. It will take the item as a parameter and return the index of the item in the list.

If you want to get the index of an item in a Mutable List you can use the function indexOf().

Hawkins Get the index of an item in a Mutable List We will be using a for loop here to iterate over the Mutable List. It means you can loop through the items of the Mutable List and use the item in each iteration of the loop. Output Iterate over a Mutable ListĪs we all know Mutable Lists in Kotlin are iterable items. print the updated mutable list - students Val students = mutableListOf('John', 'Kerry', 'Carl', 'Hawkins') It takes the index of the item as a parameter and removes that element using the index. We can use the Mutable List function removeAt() to remove an item from the list. We can also remove items from a Mutable list using the index of the item. Output Remove an item from the Mutable List abstract fun add(index: Int, element: E) Common JVM JS Native 1. abstract fun add(element: E): Boolean Inserts an element into the list at the specified index. Functions Common JVM JS Native 1.0 add Adds the specified element to the end of this list.

The mutable list has a function add() that takes the item as a parameter and adds that item to the list.Ĭode Example val numbers = mutableListOf(20, 25, 30, 35, 40, 45) The mutable list is invariant in its element type.

If you are using Mutable List in Kotlin, you can easily add new items to it. access items using square brackets and index val cars = mutableListOf('TATA', 'Nexa', 'Tesla', 'Volvo') You can access them using index and square brackets or you can also use the get() function for that and pass the item index. The items of a mutable list can be accessed using its index. To clear all the elements from the List you can set the value to emptyList(), follow the code below.Interface MutableList : List, MutableCollectionĬreate a mutable list - integer type items val mList = mutableListOf(10, 20, 30, 40, 50, 60)Ĭreate a mutable list - string type items val names = mutableListOf('Tony', 'John', 'Martin', 'Krusten') You are storing a List which is fine thats what you should do, but you can't add elements to List, you need to convert List to ArrayList and add elements to the ArrayList than update the MutableLiveData, follow the code below.

Empty mutable list kotlin