The **```kotlin.collections``` package** is part of Kotlin's standard library and contains all collection types, such as ```Map```, ```List```, ```Set```, etc.
The package provides the **```ArrayList``` class**, a mutable list that uses a dynamically resizable array as the backing storage.

#    
## The `removeAt()` method
The `ArrayList` class contains the **`removeAt()` method**, which removes an element at the specified index in the array list.

## Syntax
```
fun removeAt(index: Int): E
```

## Parameters 
This method takes an integer index as input.

## Return value
The `removeAt()` method returns the element that is removed at the specified index.

## Things to note
- `ArrayList` follows the sequence of insertion of elements.

- `ArrayList` is allowed to contain duplicate elements.

The illustration below shows the function of the `removeAt()` method.

fun main(args : Array<String>) {
    val fruitList = ArrayList<String>()
    
    fruitList.add("Orange")
    fruitList.add("Apple")  
    fruitList.add("Grapes")  
    fruitList.add("Banana")      
    println("Printing ArrayList elements --")  
    println(fruitList)  

    var removedElement = fruitList.removeAt(2)
    println("Removed element is ${removedElement}")
    println("Printing ArrayList elements after calling removeAt() --")     
    println(fruitList)    
}

#    
## Explanation
- Line 2: We create an empty array list named `fruitList` to store the strings.

- Lines 4 to 7: We use the `add()` method to add a few fruit names to the ArrayList object, such as `"Orange"`, `"Apple"`, `"Grapes"`, and `"Banana"`.

- Line 11: We call the `removeAt()` method and pass the input index as `2`. `removeAt()` removes the element at index 2, `"Grapes"`, and returns the element.

We use the `println()` function of the `kotlin.io` package to display the `ArrayList` elements and result of the `removeAt()` method.

What is the ArrayList.removeAt() method in Kotlin?

ArrayList's removeAt() method in Kotlin removes and returns the element at a specified index.

What is the ArrayList.removeAt() method in Kotlin?

The removeAt() method

Syntax

Parameters

Return value

Things to note

Explanation

The `removeAt()` method