How to use the removeFirst method of MutableList in Kotlin
Overview
The removeFirst method can be used to remove the first element of the MutableList.
Syntax
fun <T> MutableList<T>.removeFirst(): T
Parameter
This method doesn’t take any arguments.
Return value
This method returns the removed element.
Exception
If the MutalbeList is empty then NoSuchElementException is thrown.
Code
The code below demonstrates how to use the removeFirst method:
fun main() {
// create a new MutableList of int elements.
var list = mutableListOf(1, 2, 3, 4)
println("The list is $list")
val removed = list.removeFirst();
println("\nThe removed element is $removed")
println("\nNow the list is $list")
}Explanation
In the code above,
-
Line 3: We create a new
MutableListobject with namelistusing themutableListOf()method. For themutableListOf()method we provide1,2,3,4as an argument. All the provided arguments are present in the returnedlist. The list is[1,2,3,4]. -
Line 6: We use the
removeFirstmethod to remove the first element from the list. TheremoveFirstmethod removes the element1from the list[1,2,3,4]and returns it. Now the list is[2,3,4].
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