Scala Programming Projects

Declaring variables

In Scala, a variable can be declared using val or var. A val is immutable, which means you can never change its value. A var is mutable. It is not mandatory to declare the type of the variable. If you do not declare it, Scala will infer it for you.

Let's define some immutable variables:

In all the following code examples, you only need to type the code that is after the Scala Command Prompt, and hit Ctrl + Enter or cmd + return to evaluate. We show the result of the evaluation underneath the prompt, as it would appear on your screen.

scala> val x = 1 + 1x: Int = 2scala> val y: Int = 1 + 1y: Int = 2

In both cases, the type of the variable is Int. The type of x was inferred by the compiler to be Int. The type of y was explicitly ...