Kotlin Academy · Lesson

is and as Operators

Type checks and casts.

Checking and Casting Types

Kotlin offers two operators for working with types at runtime:

Both have safe variants you will learn here.

is returns a boolean telling you if a value matches a type.

It is the foundation for smart casts.

fun main() {
    val x: Any = "hello"
    println(x is String)
    println(x is Int)
}