Short Circuit Operators & 'by-name parameters' : Example...

'||' and '&&' are Short circuit Operators #126

scala> def math():Boolean = {
     |     println("Math -> False")
     |     false
     | }
math: ()Boolean

scala> def science():Boolean = {
     |     println("Science -> True")
     |     true
     | }
science: ()Boolean

scala>

scala> println("Case 1")
Case 1

scala> //Note here only math() is evaluated

scala> //ie... the evaluation for science() is declined

scala> //This is achieved through the facility for Methods(in our case &&)

scala> //called by-name parameters

scala> val res = math() && science()
Math -> False
res: Boolean = false

scala>

scala> println("Case 2")
Case 2

scala> //Note here both math() & science are evaluated

scala> val res = science() && math()
Science -> True
Math -> False
res: Boolean = false