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Create Kotlin Array Of Given Elements With Example - Tutorialwing

Create Kotlin Array Of Given Elements With Example

Program to create Kotlin array of given elements with Example.

You can create kotlin array of given elements using –

  1. Using arrayOf() library function
  2. Using factory function

1. Create Kotlin Array Using arrayOf() function –

We can use arrayOf() library function to create an array of given elements. For example,

val arr = arrayOf(1, 2, 3)

Above code creates an array of elements 1, 2 and 3 i.e. [1, 2, 3]

In other words,
If you want to use arrayOf() library function, you need to pass values of elements in array instead of just size.

Here, we created an array of 6 integer element 1, 2, 3, 4, 5 and 6.

val arr = arrayOf(1, 2, 3, 4, 5, 6)

Similarly, you can create an array of float as –

val arr = arrayOf(1.2f, 2.1f, 3.5f, 4.0f, 5.4f, 6.9f)

Other data types such as Double, Boolean, Char etc. can used to create array. You just need to pass values in arrayOf() library function.

1.1 Create array of objects using arrayOf()

If you have custom class and you want to create an array of objects, you can do so using arrayOf() function.
For example,

fun main() {

    val arr = arrayOf(CustomClass("Rohan"), CustomClass("Ram"))

    println("Elements in array: ")
    // Print each element in array.
    arr.forEach { println(it.name) }
}
class CustomClass(var name: String)

When you run above program, output will be –

Elements in array:
Rohan
Ram

2. Create Kotlin Array Using factory function

Each special class of primitive data type has a corresponding factory function that can be used to
create array. For example, IntArray class, for integer data type, has factory function intArrayOf() that can be used to create array. For example,

val arr = intArrayOf(1, 2, 3, 4, 5, 6, 7)

Note that you must pass values of elements to factory function to create array. You can n’t just pass size of array. If you have only size information, you can use IntArray(size) to create array of given size.

For example,

fun main() {

    val arr = intArrayOf(1, 2, 3, 4, 5)

    println("Elements in array: ")
    // Print each element in array.
    arr.forEach { println(it) }
}

When you run the above program, output will be –

 Elements in array:
 1
 2
 3
 4
 5
 

Similarly, you can use other factory function as well.

Data type Class Factory Function
Integer IntArray intArrayOf()
Float FloatArray floatArrayOf()
Double DoubleArray doubleArrayOf()
Boolean BooleanArray booleanArrayOf()
Char CharArray charArrayOf()
Byte ByteArray byteArrayOf()
Long LongArray longArrayOf()
Short ShortArray shortArrayOf()
Unsigned Int UIntArray uintArrayOf()
Unsigned Byte UByteArray ubyteArrayOf()
Unsigned Short UShortArray ushortArrayOf()