Expressions

Expressions are blocks of code that return a value once they are executed.

Consider the following:

val myNumber: Int = 21

val squared = myNumber * myNumber

The value of squared has been evaluated after executing the expression

myNumber * myNumber

and it will have the result:

squared: Int = 441

Expressions can have many lines. The value of the last line is returned as the resulting value of the expression:

val cubeIsGreaterThanTen: Boolean = {
  val cubed = myNumber * myNumber * myNumber
  cubed > 10
}

Result:

cubeIsGreaterThanTen: Boolean = true