How to use primitive types in Kotlin?

Question

Kotlin automatically forces us to use wrappers like Float, Double, Int, Boolean, etc.

But sometimes, for performance and memory reasons, we need to use primitive types.

I am aware that this can be done if you use special arrays such as IntArray, DoubleArray, FloatArray, etc.

But what about single primitives in a variable?

Answer 1

Kotlin doesn't use wrapper types for non-nullable types, such as Int or Float - those will get compiled into int and float . However, if you use nullable types, such as Int? or Float? , Kotlin will use wrapper types - Integer and Float - to be able to represent null values. Using non-nullable primitive types in Kotlin will not lead to unnecessary allocations.