Top 10 Kotlin Features Every Android Developer Must Know

Source: Dhiwise

Here’s a guide to the top 10 Kotlin features every Android developer should have up their sleeve.

1. Null Safety

Let’s be real — nobody enjoys those dreaded NullPointerExceptions. You’re minding your own business, building your app, and BAM! A null sneaks in and brings everything crashing down. Kotlin’s null safety is like an invisible guardian against this chaos. By design, Kotlin doesn’t allow null values unless explicitly stated, so if a variable can’t hold null, it won’t.

Null safety brings peace of mind because the compiler can spot possible null values and prevent them from creeping into the app. Think of it as the difference between wearing a seatbelt and driving without one — it’s that bit of insurance that makes everything a little safer.

2. Extension Functions

Extension functions in Kotlin are a bit like a Swiss Army knife. They let you add new functionality to existing classes without modifying their source code — no need to reinvent the wheel. Want a custom method for String or View? Done. Need something tailored for your own data class? Piece of cake.

Imagine you have a List<User> and want to find all users over 21. You can create an extension function called List<User>.getAdults() and…