Task 3:

• Look at the first two variants of the orMap method (the recursively defined variant and the variant that uses the while loop. Identify the four parts (BASE-VALUE, Termination/Continuation PREDICATE, UPDATE, and ADVANCE) in each of them.

  Look also at the tests in the Examples class.

• After you understand how the while loop works, design two variants of the method filter that produces a new ArrayList that contains all elements of the original list that satisfy the given ISelect predicate.

  Test the methods by producing all albums released before the given year.

• Optional — skip and finish at home, if necessary

  Design and test two variants of the andMap method that determines whether all elements of a given list satisfy the given ISelect predicate.

  Test the methods by producing all albums released before the given year.

Converting while loops into for loops

If you have the time left, repeat all the parts of Task 3 with the remaining two variants of the orMap — namely the one that uses the for loop with the Traversal and the one that uses counted for loop.

Portfolio

At home, add to your lab project a new class that represents data of your choice, design an ISelect predicate for that class of data, and test all methods on ArrayLists of your data.