The sublist(start,end) method gives you the ability to extract a sub-list. To shrink the collection you can use remove and clear which remove one instance of an element and all of the elements respectively. You can also use the addAll method to add a list of elements in one go. The add method adds to the end of the collection by default, but you can insert an element at a specific position.įor example: var a:MutableList = mutableListOf('x','y','z')

To add an element beyond what are already there you have to use the add method: var a:MutableList = mutableListOf('x','y','z') If you are familiar with more permissive languages such as JavaScript you might think that this allows you to reference elements that don't exist. The big difference is that you can make the MutableList bigger. Val mutableList = mutableListOf(1, 3, 9, 16)Ĭoncluding this introductory tutorial to Mutable List in Kotlin, we have covered only basic topics like creating, adding an element and removing an element.You can create a MutableList in the same way as a List: var a:MutableList = mutableListOf('x','y','z')

In the following program, we will create a mutable list of integers, and remove the element 9 from the mutable list using remove(element) function.

The syntax to use remove() function with element is MutableList.remove(element) The first occurrence, if any, of this specified element will be removed from this mutable list. To remove an element from a Mutable List, call remove() function on this mutable list and pass the element. In the following program, we will create a mutable list of integers, and add elements to it using add(element) and add(index, element) functions. The syntax to use add() function with specific index and element is MutableList.add(index, element) The syntax to use add() function with element is MutableList.add(element) We can also specify the index, at which the element has to be inserted. The new element will be added at the end of the list. To add an element to a Mutable List, call add() function on this mutable list and pass the element. In the following program, we will create a mutable list of integers. The syntax of mutableListOf() function is fun mutableListOf(vararg elements: T): MutableList To create a mutable list in Kotlin, call mutableListOf() function and pass the elements to it.

Kotlin mutable list