In this guide, we will learn about the Kotlin mutableListOf() function with lots of examples.
What is mutableListOf()?
The mutableListOf() function in Kotlin is a utility function that allows you to create a mutable list. As opposed to the read-only lists created using listOf(), mutable lists can be modified after their creation, allowing elements to be added, removed, or updated.
Basic Syntax:
val mutableList: MutableList<Type> = mutableListOf(element1, element2, element3, ...)Examples with Outputs
Creating a Basic Mutable List of Integers
val numbers = mutableListOf(1, 2, 3)
println(numbers) // Output: [1, 2, 3]Adding Elements to the List
val animals = mutableListOf("Dog", "Cat")
animals.add("Bird")
println(animals) // Output: [Dog, Cat, Bird]Removing Elements from the List
val colors = mutableListOf("Red", "Blue", "Green")
colors.remove("Blue")
println(colors) // Output: [Red, Green]Modifying Elements in the List
val fruits = mutableListOf("Apple", "Banana", "Cherry")
fruits[1] = "Mango"
println(fruits) // Output: [Apple, Mango, Cherry]Merging Two Mutable Lists
val list1 = mutableListOf(1, 2, 3)
val list2 = mutableListOf(4, 5, 6)
list1.addAll(list2)
println(list1) // Output: [1, 2, 3, 4, 5, 6]Clearing All Elements from the List
val data = mutableListOf("A", "B", "C")
data.clear()
println(data) // Output: []Convert a mutableListOf() to an immutable list and vice versa
val mutableList = mutableListOf(1, 2, 3)
val immutableList = mutableList.toList()
val backToMutable = immutableList.toMutableList()Conclusion
In Kotlin, mutableListOf() is a standard library function that provides a dynamic way to create lists whose elements can be altered – you can add, remove, or modify elements as per your requirements.
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