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20150313a

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if / else

The if / else construct is an expression, thus it has a value that you can store in a variable:

val s = if (x > 0) "sca" else "la"    // s is either "sca" or "la", depending on x

Unit

The equivalent of void is Unit. Unit is a class that has one value, written as ().

Block ( { … } )

The value of a block is the value of its last expression. Thus, you can write such things as:

scala> val x = {
     | val a = 5    // local variable of the block
     | val b = 3
     | scala.math.pow(a, b)
     | }
x: Double = 125.0