📌 Arrays in Kotlin

In Kotlin, an Array is a collection of fixed-size, ordered data of the same type. Arrays are widely used to store multiple values in a single variable.

✅ Creating Arrays in Kotlin

1. Using arrayOf()

kotlin
val intArray = intArrayOf(1, 2, 3)val doubleArray = doubleArrayOf(1.1, 2.2, 3.3)val charArray = charArrayOf('A', 'B', 'C')

3. Using Array Constructor

kotlin
// Creates an array of size 5 with values as the index multiplied by 2val array = Array(5) { it * 2 }println(array.joinToString()) // Output: 0, 2, 4, 6, 8

✅ Accessing Elements in an Array

You can access array elements using:

• Indexing: (Starts from 0)

• get() and set() functions

kotlin
val fruits = arrayOf("Apple", "Banana", "Cherry")// Using Indexprintln(fruits[1])  // Output: Banana// Using get() functionprintln(fruits.get(2))  // Output: Cherry// Updating value using set() functionfruits.set(1, "Mango")println(fruits[1])  // Output: Mango

✅ Array Properties and Functions

• size → Returns the number of elements in the array.

• first() → Returns the first element.

• last() → Returns the last element.

• contains() → Checks if an element exists in the array.

• indexOf() → Returns the index of an element or -1 if not found.

kotlin
val numbers = arrayOf(10, 20, 30, 40, 50)println("Size: ${numbers.size}")         val names = arrayOf("John", "Emma", "Alex")for (name in names) {    println(name)}

2. Using forEach

kotlin
names.forEach { println(it) }

3. Using Indices

kotlin
for (index in names.indices) {    println("Index $index: ${names[index]}")}

✅ Multidimensional Arrays

Kotlin supports 2D and 3D Arrays using the Array class.

kotlin
// 2D Array (3x3 Matrix)val matrix = Array(3) { Array(3) { 0 } }matrix[0][1] = 5println(matrix[0][1])  // Output: 5

✅ Conclusion

• Use arrayOf() for general-purpose arrays.

• Use intArrayOf(), charArrayOf(), etc., for primitive types.

• Arrays are fixed in size and cannot be resized. For dynamic collections, use Lists instead.