Kotlin ArrayListOf - Scaler Topics

Overview

In Kotlin, an ArrayList, specifically created using the arrayListOf function, is a dynamic array that can store a collection of elements. It's flexible and allows for adding, modifying, and removing items efficiently. You can declare and initialize a Kotlin arrayListOf with a specific data type, making it a versatile tool for managing lists of elements in your code.

Syntax

1.Creating an Empty ArrayList:

Creating an ArrayList with Provided Elements:

Examples

1. Kotlin Program To Make New Empty ArrayList

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2. Kotlin Program To Make New ArrayList with String Elements

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3. Kotlin Program To Make New ArrayList With Elements Of Any Data Type

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Functions of ArrayListOf

add(element):
This function is used to add a single element to the end of an ArrayList.

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add(index, element):
This function is used to insert a single element at a specific index within an ArrayList.

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addAll(elementCollection):
This function is used to add all elements from another collection to the end of an ArrayList

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addAll(index, elementCollection):
This function is used to add all elements from another collection to a specific index within an ArrayList.

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clear():
The clear method is used to remove all the elements from an ArrayList, effectively making it an empty ArrayList.

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contains(element):
This function is used to check whether a specific element exists in an ArrayList. It returns true if the element is found in the ArrayList, and false otherwise.

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containsAll(elementCollection):
This function is used to check if all elements in the specified collection are found in the ArrayList and returns true if so; otherwise, it returns false.

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get(index):
This function retrieves an element at a specific index in an ArrayList.

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indexOf(element) :
This function returns the index of the first occurrence of an element in an ArrayList, or -1 if the element is not found.

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lastIndexOf(element):
This function returns the index of the last occurrence of an element in an ArrayList, or -1 if the element is not found.

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remove(element) :
This function removes an element from an ArrayList and returns true if successful, false if the element is not found.

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removeAll(elementCollection) :
This function removes elements from an ArrayList and returns true if any elements were removed, or false if none were found.

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removeAt(index):
removes an element by its position in an ArrayList, returning true if the element is successfully removed, or false if not found.

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set(index, element):
This function updates the element at a specific position in an ArrayList.

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toArray():
This function converts an ArrayList into an array of a specific type.

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toString():
This function is used to obtain the string representation of an ArrayList object.

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isEmpty() :
This function is used to check if an ArrayList is empty.

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Conclusion

ArrayList in Kotlin is a dynamic, flexible data structure that allows you to store and manage collections of elements efficiently.
You can create an ArrayList using the arrayListOf() function, which can be initially empty or contain specific elements.
Kotlin arrayListOf is versatile and supports various operations, including adding, inserting, removing, and updating elements, making them a powerful tool for list management.
Key functions such as add, addAll, remove, set, and others provide convenient ways to manipulate the content of an ArrayList.
You can also check for the presence of elements, find their indices, convert a Kotlin arrayListOf to an array, and check if it's empty, making Kotlin arrayListOf a comprehensive tool for handling lists in Kotlin.