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  1. object Main extends App {
  2.     println("Actually executing")
  3.    	// val studentList = Option(Seq(
  4.     //       new Student("alex", "seattle", "92394"),
  5.     //       new Student("james", "london", "32e12321"),
  6.     //       new Student("jon", "denvor", "123123")
  7.     //     ))
  8.  
  9.            	// val studentList = Option(Seq.empty[Student])
  10.  
  11.            	val studentList = None
  12.  
  13.    	val studentFull = Seq(
  14.           new Student("alex", "seattle", "92394"),
  15.           new Student("james", "london", "32e12321"),
  16.           new Student("jon", "denvor", "123123")
  17.         )
  18.  
  19.         val studentEmpty = Seq.empty[Student]
  20.  
  21.         println("Student full " + studentFull.headOption)
  22.         println("Student empty " + studentEmpty.headOption)
  23.  
  24.         val maybePerson = studentFull.headOption match {
  25.         	case Some(p) => Option(new Person(
  26.         		p.name, p.address))
  27.         	case _ => None
  28.         }
  29.  
  30.         println("Maybe person from student full " + maybePerson.toString)
  31.  
  32.         val maybePerson2 = studentEmpty.headOption match {
  33.         	case Some(p) => Some(new Person(
  34.         		p.name, p.address))
  35.         	case _ => None
  36.         }
  37.  
  38.         println("Maybe person from student empty " + maybePerson2.toString)
  39.  
  40.         val maybePerson3 = studentList.getOrElse(Seq.empty).headOption match {
  41.         	case Some(p) => {
  42.         		println("case 1")
  43.         		Some(new Person(
  44.         	     "abc", "bcd"))
  45.         	}
  46.         	case _ => {
  47.         		println("case 2")
  48.         		None
  49.         	}
  50.         }
  51.  
  52.         println("Maybe person from student " + maybePerson3.toString)
  53. }
  54.  
  55. case class Student (
  56.                      name: String,
  57.                      address: String,
  58.                      phoneNo: String
  59.                    )
  60.  
  61. case class Person (
  62. 	name: String,
  63. 	address: String
  64. 	)
Success #stdin #stdout 0.47s 67432KB
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stdin
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Standard input is empty
stdout
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Actually executing
Student full Some(Student(alex,seattle,92394))
Student empty None
Maybe person from student full Some(Person(alex,seattle))
Maybe person from student empty None
case 2
Maybe person from student None
https://ideone.com/OIvydI
language:
Scala (scala 2.12.8)
created:
4 years ago
visibility:
public

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