Booleans

Booleans are rather standard, and support the usual negation, conjunction, and disjunction operations. Conjunction and disjunction are lazily evaluated, so if the left-hand side satisfies the clause, then the right-hand side will not be evaluated. Let's look at an example of the lazy evaluation:

    val x = 1 
    val y = 2 
    val z = 2 
 
    val b = x > y && x > z
    val c = y == z || x == z 

In the preceding code, since x is not greater than y, the value of b cannot be true, therefore, the right-hand side of the && operator is not invoked. Similarly, since y is equal to z, c will be true, and there is no need to evaluate the right-hand side of ||.