Optional side-effect



In [6]:

    
val nameOpt = Option("Amir")

def printName(name: String) = println(name)









    





nameOpt: Option[String] = Some("Amir")
defined function printName



In [7]:

    
nameOpt.foreach(printName)









    



Amir



In [4]:

    
val anotherOpt = None









    





anotherOpt: None.type = None



In [5]:

    
anotherOpt.foreach(printName)

This is a great pattern for optinally generating side-effects given an option that you take from the command line, namely in conjunction with scallop.