Learning RxJava - Second Edition

Assigning properties and variables

To declare a variable or property, you must decide whether to make it mutable. Preceding a variable declaration with a val will make it only assignable once, whereas var is mutable and can be reassigned a value multiple times. The name of the variable then follows, with a colon separating it from the type. Then, you can assign a value if you have it on hand. In the following code (the ch12_01.kt example), we assign a variable for an Int and a String and print them in an interpolated string:

fun main(args: Array<String>) {     val myInt: Int = 5     val myString: String = "Alpha"     println("myInt=$myInt and myString=$myString") }

The output is as follows:

myInt=5 and myString=Alpha

Kotlin's compiler is pretty smart ...