685 B
685 B
title
| title |
|---|
| Extension Functions |
Extension Functions
Kotlin supports extension functions & extension variables, which allow you to add new functionality to a class without modifying the class itself.
Basic Usage
Extension Function
fun String.containsSpaces(): Boolean {
return contains(" ")
}
val myString = "Hello World"
print(myString.containsSpaces())
Output:
true
Extension Variable
val <T> List<T>.lastIndex: Int
get() = size - 1
val myList = listOf(1,2,3,4,5)
print(myList.lastIndex)
Output:
4