What is the difference between IntArray and Array<Int> in the context of programming languages?

In Kotlin, IntArray is a specialized array for storing primitive Int values. It stores data as primitives, which saves memory and improves performance when working with large volumes of numbers.

Array<Int> is a generic array of objects, where each element is an Int object (a wrapper around the primitive). Such an array stores references to objects, which can be less efficient in terms of memory and speed.

Example:

val intArray: IntArray = intArrayOf(1, 2, 3) // array of primitives
val arrayInt: Array<Int> = arrayOf(1, 2, 3) // array of objects

Use IntArray for numeric data when performance is important, and Array<Int> when you need an array of objects (for example, to work with null values or generic functions).