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

#    
## The remove() method
The `ArrayList` class contains the **`remove()` method** which removes the single instance of the specified element from the array list.

## Syntax
```kotlin
fun remove(element: E): Boolean
```

## Parameters 
- This method takes the element to remove as the input.

## Return value
- It returns true if the element is successfully removed from the array list and false if the input element is not present in the collection.

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

- It is allowed to contain duplicate elements.

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

## Code

Run the code below to see how the `remove()` method works.

fun main(args : Array<String>) {
    val monthList = ArrayList<String>()
    
    monthList.add("January")
    monthList.add("February")  
    monthList.add("December")  
    monthList.add("March")      
    monthList.add("April") 
    println("Printing ArrayList elements --")  
    println(monthList)  

    monthList.remove("December")   
    println("Printing ArrayList elements after calling remove() --")     
    println(monthList)    
}

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

- Line 4 to 8: We add a few month names to the ArrayList object using the `add()` method, such as: `"January"`, `"February"`, `"December"`, `"March"`, and `"April"`.

- Line 12: We call the `remove()` method and pass the input string as `"December`". It removes the element `"December"` present in the list at index 2  and returns true.

The `Arraylist` elements and result of the `remove()` method are displayed using the `println()` function of the kotlin package.


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

Kotlin's ArrayList.remove() removes a specified element, returning true if successful and false if not found.