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Blog: Fixed in Size, Flexible in Power - Arrays in Kotlin

Blog: Fixed in Size, Flexible in Power - Arrays in Kotlin

Day 30! Today I took a deep dive into Arrays. If you think you know arrays from Java or C++, Kotlin has some surprises in store that make them much more developer-friendly.

Beyond the Basics

Creating an array in Kotlin feels very modern. Instead of just a fixed size and curly braces, I learned about the Array constructor. It lets you define exactly what goes into each index using a lambda.

val squares = Array(5) { i -> i * i }

It’s like a factory and a loop rolled into one!

The Performance Trap

One of the most important things I learned was the difference between Array<Int> and IntArray. - Array<Int> is an array of objects. It’s flexible but can be slow. - IntArray is a true primitive array. No boxing, no overhead—just pure speed. If you're doing heavy math or processing large amounts of data, IntArray is your secret weapon.

The == Pitfall

If you've ever tried to compare two arrays using == and gotten false even though they look identical, you've hit the referential equality wall. In Kotlin, == for arrays checks if they are the exact same instance. To check the data inside, you use .contentEquals(). It’s a simple rule, but vital for avoiding bugs!

The Spread Operator

Passing an array to a function that takes variable arguments (varargs) used to be a bit clunky. Kotlin makes it "explode" with the Spread Operator (*). It’s such a satisfying syntax: printAll(*myArray).

Multidimensional Ease

Multidimensional arrays are just arrays of arrays, but Kotlin makes them easy to work with. I especially appreciated .contentDeepToString(), which finally makes printing a matrix as easy as printing a single number.

Summary

Arrays in Kotlin provide a perfect balance: the performance of the underlying JVM primitive arrays with the high-level, expressive syntax we expect from a modern language.

Check out the full technical breakdown!

Kotlin #Arrays #Performance #CleanCode #ProgrammingJourney #JVM #DataStructures

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