How do you define an extension property in Kotlin?

To define an extension property in Kotlin, you use the same syntax as defining extension functions, but without parentheses for parameters. Extension properties do not have a backing field, so you must provide custom getters and setters if needed.

Here’s the general syntax for defining an extension property:

kotlin

val Type.propertyName: PropertyType
 get() = // Custom getter logic

var Type.mutablePropertyName: PropertyType
 get() = // Custom getter logic
 set(value) { // Custom setter logic }

Once defined, extension properties can be accessed and used just like regular properties of the extended class, providing a seamless way to extend the functionality of existing classes in Kotlin.