Kotlin mutableListOf()

In Kotlin, mutableListOf() is a function that creates a new MutableList and returns it. A MutableList is a collection that allows modifications or changes to be made to its elements. In this tutorial, we'll explore the mutableListOf() function and how to use it in Kotlin.

Syntax

The syntax for using mutableListOf() function is as follows:

mutableListOf<T>(elements: T...)

Here, T refers to the type of the elements in the list, and elements is the list of elements to add to the MutableList.

Example

Let's say we want to create a list of integers using the mutableListOf() function. Here's an example:

val myNumbersList = mutableListOf(1, 2, 3, 4, 5)

In this example, we've created a new MutableList of integers and assigned it to the myNumbersList variable.

Output

If we print the myNumbersList variable using the println() function, we'll see the following output:

[1, 2, 3, 4, 5]

This output shows the elements in the MutableList.

Explanation

The mutableListOf() function is used to create a mutable list in Kotlin. The elements added to the list can be modified or changed. The MutableList is similar to an Array in Kotlin, but with the added functionality of inserting, removing, and updating elements.

To create a MutableList using the mutableListOf() function, we pass the elements we want to add to the list as arguments. The function then returns a new MutableList with the elements added to it.

Use

The mutableListOf() function is useful for creating a MutableList with a fixed set of elements or initializing a list with some default values.

We can also add elements to the list using the add() method, remove elements using the remove() method, or update elements using their index value.

Important Points

• MutableList is a collection that allows modifications to be made to its elements.
• mutableListOf() function creates a new MutableList with the elements passed to it as arguments.
• Elements can be added, removed, or modified in a MutableList.

Summary

In this tutorial, we learned about the mutableListOf() function in Kotlin, how to use it to create a new MutableList, and how to add, remove, or modify elements in it. With this knowledge, we can create mutable lists with ease and manipulate them to perform various operations in our Kotlin programs.