[Lecture Notes]Programming Methodology

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Date	Notes
Tuesday, Jan 19	No class.
Wednesday, Jan 20	No lab.
Thursday, Jan 21	Out: HW1. Lecture  Notes.
Tuesday, Jan 26	Lecture Notes.
Wednesday, Jan 27	Lab: Help session for Homework 1.
Thursday, Jan 28	Due: HW1. Out: HW2. Lecture  Notes.
Tuesday, Feb 2	Lecture Notes.
Wednesday, Feb 3	Lab: Distributed during lab.
Thursday, Feb 4	Lecture  Notes. Due: HW2. Out: HW3.
Tuesday, Feb 9
Wednesday, Feb 10	Lab: Distributed during lab.
Thursday, Feb 11	Due: HW3. Out: HW4. Lecture  Notes
Tuesday, Feb 16	No class. (Monday schedule)
Wednesday, Feb 17	Lab:
Thursday, Feb 18	Out: HW5. Lecture  Notes
Tuesday, Feb 23	Due: HW4. Lecture  Notes
Wednesday, Feb 24	Lab: Steps 1 and 2 of HW5
Thursday, Feb 25	Lecture Notes
Tuesday, Mar 1	Due: HW5. Out: HW6. Lecture  Notes
Wednesday, Mar 2	Lab: Steps 1 and 2(a) of HW6.
Thursday, Mar 3	Lecture Notes
Tuesday, Mar 8	Due: HW6. Lecture  Notes.
Wednesday, Mar 9	No Lab. (No assignment due.)
Thursday, Mar 10	Lecture Notes
Tuesday, Mar 15	No class. (Spring Recess)
Wednesday, Mar 16	No lab. (Spring Recess)
Thursday, Mar 17	No class. (Spring Recess)
Tuesday, Mar 22	Out: HW7. Lecture  Notes
Wednesday, Mar 23	Lab: Step 1 of HW7.
Thursday, Mar 24
Tuesday, Mar 29	Reading: Enumerating the Rationals (in Scala)
Wednesday, Mar 30	No lab. (Continue working on Sudoku.)
Thursday, Mar 31	Reading: Java Regular Expressions and Scala Regular Expressions
Tuesday, Apr 5	Due: HW7. Out: HW8.
Wednesday, Apr 6	Lab: Steps 1 and 2 of HW8.
Thursday, Apr 7	Code from class
Tuesday, Apr 12	Due: HW8. Out: HW9. Reading: Chapter 33 of  Programming in Scala.
Wednesday, Apr 13	Lab: Tasks 2 and 5 of HW9.
Thursday, Apr 14
Tuesday, Apr 19	Due: HW9. Out: HW10.
Wednesday, Apr 20	No lab. (Monday schedule.)
Thursday, Apr 21
Tuesday, Apr 26	Due: HW10.

https://people.cs.umass.edu/~arjun/courses/cmpsci220-spring2016/schedule/

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关键词：Methodology Programming methodolog Lecture Program schedule during

1. 2.2 The Filter Function
   
2. Another common pattern when programming with lists is to select certain elements that
   
3. have some property. For example, here is a function that consumes a list, and produces a
   
4. new list that only contains the even numbers:
   
5. def filterEven ( lst : List [ Int ]): List [ Int ] = lst match {
   
6. case Nil => Nil
   
7. case head :: tail =>
   
8. ( head % 2 == 0) match {
   
9. case true => head :: filterEven ( tail )
   
10. case false => filterEven ( tail )
    
11. }
    
12. }
    
13. This is a very common pattern too. For example, we could write a function to select the
    
14. odd numbers or the prime numbers. If we had a list of strings, we could select all the strings
    
15. with length 5 or all the strings that represent English-language words. All these functions
    
16. have the same shape: they test the value of head in some way. If the test succeeds, head is
    
17. added in the output list. But, if the test fails, it is excluded.
    
18. Following the same strategy we used to derive map, we first package the head-test into a
    
19. function:
    
20. def f(n: Int ): Boolean = head % 2
    
21. def filterEven ( lst : List [ Int ]): List [ Int ] = lst match {
    
22. case Nil => Nil
    
23. case head :: tail =>
    
24. f( head ) match {
    
25. case true => head :: filterEven ( tail )
    
26. case false => filterEven ( tail )

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