OptionUsageExamples.scala

//proper way to wrap calls to java apis
val map = new java.util.HashMap[String, String]()
map.put("key1", "value1")
val maybeValue1 = Option(map.get("key1")) //Some("value1")
val maybeValue2 = Option(map.get("key2")) //None

//equivalent of "if(x != null && condition(x))"
val optionX: Option[T] = Option(x)
optionX.exists(condition)

//equivalent of "if(x == null || condition(x))"
optionX.forall(condition)

//equivalent of "if(x != null && condition(x)) f(x)"
optionX.filter(condition).map(f)

// map and flat map example:
val x = Some(Map("a" -> "some value"))
x.flatMap(_.get("a")).map(_.toUpperCase) // Some("SOME VALUE")
x.flatMap(_.get("b")).map(_.toUpperCase) // None - notice how nice 
//the lack of value for given key in map is handled

//options with for-comprehension
for {
	a <- Some(1)
	b <- Some(2)
} yield a + b // Some(3)