[Lecture Notes]Programming Languages: Scala,Columbia University

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Lectures

Syllabus is tentative and subject to change. Homework assignments are [size=13.3333330154419px]on the homework page.

Date	Topic
Wed 10/22/2014	Introduction. Running Scala. Basic types. Basic control structures. Functions.
Wed 10/29/2014	Classes and objects. Inheritance. Applications.Packages and imports.
Wed 11/05/2014	Higher-order functions (Function literals. Closures. Patially applied functions. Evaluation order.
Wed 11/12/2014	Pattern Matching. Case Classes.
Wed 11/19/2014	Error Handling. Traits. Type variance and bounds.
Wed 11/26/2014	no class.
Wed 12/03/2014	Concurrency

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关键词：Programming University Languages Universit Columbia University Running control objects change

Homework Assignments

Date	Due date	Topic	Materials	Solution
10/22	10/28	Functions, Recursion, Control Structures, Basic Types	Collatz.scala, Rotate.scala	solution_week1.tgz
10/30	11/04	OOP: Objects, Classes, Methods, Inheritance	AquariumSimulator.scala (Updated)	solution_week2.tgz
11/6	11/11	Higher-Order Functions	Part2.scala	solution_week3.tgz
11/14	11/18	By-Name Parameters. Pattern Matching and Case Classes. Packages.	cards.tgz	solution_week4.tgz(updated)
11/21	11/30	Maps. Traits.		solution_week5.tgz

Books[size=13.3333330154419px]There is no official textbook. Here are some recommendations:

• Martin Odersky, Lex Spoon, and Bill Venners (2010): Programming in Scala, Second Edition. Artima.
      THE scala book (the "staircase" book), co-authored by Scala creator Martin Odersky, but not fully up-to-date.
  
• Cay S. Horstman (2012): Scala for the Impatient. Addison-Wesley Professional.
  

Online Resources

• scala-lang.org - The official Scala website, includes official documentation.
• Scala language API
• Twitter Scala School (on github)
  

1. scala > val month : Int = 8
   
2. month : Int = 8
   
3. scala > val monthString : String = month match {
   
4. case 1 = > " January "
   
5. case 2 = > " February "
   
6. case 3 = > " March "
   
7. case 4 = > " April "
   
8. case 5 = > " May "
   
9. case 6 = > " June "
   
10. case 7 = > " July "
    
11. case 8 = > " August "
    
12. }
    
13. monthString : String = August

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1. abstract class Publication
   
2. class Novel ( val author : String , val title : String )
   
3. extends Publication
   
4. class Anthology ( val title : String )
   
5. extends Publication
   
6. val a = new Anthology ( " Great Poems " )
   
7. val b = new Novel ( " The Castle " ," F . Kafka " )
   
8. scala > val books = List (a , b )
   
9. books : List [ Publication ] = List ( Anthology@2c78beb8 ,
   
10. Novel@2a3ec96e )

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1. Use the case modifier to define case classes.
   
2. abstract class Publication
   
3. case class Novel ( title : String , author : String ) extends
   
4. Publication
   
5. case class Anthology ( title : String ) extends
   
6. Publication
   
7. val a = Anthology ( " Great Poems " )
   
8. val b = Novel ( " The Castle " , " F . Kafka " )
   
9. scala > val books : List [ Publication ] = List (a , b )
   
10. books : List [ Publication ] = List ( Anthology ( Great Poems ) ,
    
11. Novel ( The Castle , F . Kafka ))

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1. abstract class Publication
   
2. case class Novel ( title : String , author : String ) extends
   
3. Publication
   
4. case class Anthology ( title : String ) extends
   
5. Publication
   
6. val a = Anthology ( " Great Poems " )
   
7. val b = Novel ( " The Castle " , " F . Kafka " )
   
8. val books : List [ Publication ] = List (a , b )
   
9. scala > for ( book <- books ) {
   
10. val description = book match {
    
11. case Anthology ( title ) = > title
    
12. case Novel ( title , author ) = > title + " by " + author
    
13. }
    
14. println ( description )
    
15. }
    
16. Great Poems
    
17. The Castle by F . Kafka

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1. sealed abstract class Publication
   
2. case class Novel ( title : String , author : String ) extends
   
3. Publication
   
4. case class Anthology ( title : String ) extends
   
5. Publication

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1. abstract class Publication {
   
2. val title : String
   
3. }
   
4. case class Novel ( title : String , author : String ) extends
   
5. Publication
   
6. case class Anthology ( title : String ) extends
   
7. Publication
   
8. val a = Anthology (" Great Poems ")
   
9. val b = Novel (" The Castle " , "F. Kafka ")
   
10. val books : List [ Publication ] = List (a ,b)
    
11. scala > for ( book <- books ) {
    
12. val description = book match { // order matters !
    
13. case Novel ( title , "F. Kafka ") => title + " by Kafka "
    
14. case Novel ( title , author ) => title + " by " + author
    
15. case other => other . title
    
16. }
    
17. println ( description )
    
18. }
    
19. Great Poems
    
20. The Castle by Kafka

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1. abstract class Expr
   
2. case class Var ( name : String ) extends Expr
   
3. case class Number ( num : Double ) extends Expr
   
4. case class UnOp ( operator : String , arg : Expr ) extends Expr
   
5. case class BinOp ( operator : String ,
   
6. left : Expr , right : Expr ) extends Expr

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