Skip to content

Homework part2_Komarova #178

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 2 commits into
base: master
Choose a base branch
from
Open

Homework part2_Komarova #178

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
b9f6674
homework_part2
In-somnia Jul 6, 2017
b900626
homework_part2
In-somnia Jul 6, 2017
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
28 changes: 21 additions & 7 deletions src/test/java/lambda/part2/exercise/ArrowNotationExercise.java
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -14,35 +14,49 @@ public class ArrowNotationExercise {
@Test
public void getAge() {
// Person -> Integer
final Function<Person, Integer> getAge = null; // TODO
final Function<Person, Integer> getAge = Person::getAge; // TODO

assertEquals(Integer.valueOf(33), getAge.apply(new Person("", "", 33)));
}

private static boolean sameAges(Person p1, Person p2) {
return p1.getAge() == p2.getAge();
}

@Test
public void compareAges() {
// TODO use BiPredicate
// compareAges: (Person, Person) -> boolean
final BiPredicate<Person, Person> compareAges = ArrowNotationExercise::sameAges;


throw new UnsupportedOperationException("Not implemented");
//assertEquals(true, compareAges.test(new Person("a", "b", 22), new Person("c", "d", 22)));
//throw new UnsupportedOperationException("Not implemented");
assertEquals(true, compareAges.test(new Person("a", "b", 22), new Person("c", "d", 22)));
}

// TODO
// getFullName: Person -> String

private String getFullName(Person p) {
return p.getFirstName() + " " + p.getLastName();
}
// TODO
// ageOfPersonWithTheLongestFullName: (Person -> String) -> (Person, Person) -> int
// ageOfPersonWithTheLongestFullName: (Person -> String) => ((Person, Person) -> int)
//
private BiFunction<Person, Person, Integer> ageOfPersonWithLongestFullName(Function<Person, String> fullName) {
return (Person p1, Person p2) -> fullName.apply(p1).length() > fullName.apply(p2).length()
? p1.getAge()
: p2.getAge();
}

@Test
public void getAgeOfPersonWithTheLongestFullName() {
// Person -> String
final Function<Person, String> getFullName = null; // TODO
final Function<Person, String> getFullName = this::getFullName; // TODO

// (Person, Person) -> Integer
// TODO use ageOfPersonWithTheLongestFullName(getFullName)
final BiFunction<Person, Person, Integer> ageOfPersonWithTheLongestFullName = null;
final BiFunction<Person, Person, Integer> ageOfPersonWithTheLongestFullName =
ageOfPersonWithLongestFullName(getFullName);

assertEquals(
Integer.valueOf(1),
Expand Down
32 changes: 10 additions & 22 deletions src/test/java/lambda/part2/exercise/FunctionCombinationExercise.java
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -19,22 +19,14 @@ public void personHasNotEmptyLastNameAndFirstName0() {
assertEquals(false, validate.test(new Person("a", "", 0)));
}

// TODO
// negate1: (Person -> boolean) -> (Person -> boolean)
private Predicate<Person> negate1(Predicate<Person> test) {
return p -> {
// TODO
throw new UnsupportedOperationException();
};
return p -> !test.test(p);
}

// TODO
// validateFirstNameAndLastName: (Person -> boolean, Person -> boolean) -> (Person -> boolean)
private Predicate<Person> validateFirstNameAndLastName(Predicate<Person> t1, Predicate<Person> t2) {
return p -> {
// TODO
throw new UnsupportedOperationException();
};
return p -> t1.test(p) && t2.test(p);
}

@Test
Expand All @@ -52,29 +44,25 @@ public void personHasNotEmptyLastNameAndFirstName1() {
assertEquals(false, validate.test(new Person("a", "", 0)));
}

// TODO
// negate: (T -> boolean) -> (T -> boolean)
private <T> Predicate<T> negate(Predicate<T> test) {
// TODO
throw new UnsupportedOperationException();
return T -> !test.test(T);
}

// TODO
// and: (T -> boolean, T -> boolean) -> (T -> boolean)
private <T> Predicate<T> and(Predicate<T> t1, Predicate<T> t2) {
// TODO
throw new UnsupportedOperationException();
return T -> t1.test(T) && (t2.test(T));
}

@Test
public void personHasNotEmptyLastNameAndFirstName2() {
final Predicate<Person> hasEmptyFirstName = p -> p.getFirstName().isEmpty();
final Predicate<Person> hasEmptyLastName = p -> p.getLastName().isEmpty();

final Predicate<Person> validateFirstName = null; // TODO use negate
final Predicate<Person> validateLastName = null; // TODO use negate
final Predicate<Person> validateFirstName = negate(hasEmptyFirstName); // TODO use negate
final Predicate<Person> validateLastName = negate(hasEmptyLastName); // TODO use negate

final Predicate<Person> validate = null; // TODO use and
final Predicate<Person> validate = validateFirstName.and(validateLastName); // TODO use and

assertEquals(true, validate.test(new Person("a", "b", 0)));
assertEquals(false, validate.test(new Person("", "b", 0)));
Expand All @@ -86,10 +74,10 @@ public void personHasNotEmptyLastNameAndFirstName3() {
final Predicate<Person> hasEmptyFirstName = p -> p.getFirstName().isEmpty();
final Predicate<Person> hasEmptyLastName = p -> p.getLastName().isEmpty();

final Predicate<Person> validateFirstName = null; // TODO use Predicate::negate
final Predicate<Person> validateLastName = null; // TODO use Predicate::negate
final Predicate<Person> validateFirstName = hasEmptyFirstName.negate(); // TODO use Predicate::negate
final Predicate<Person> validateLastName = hasEmptyLastName.negate(); // TODO use Predicate::negate

final Predicate<Person> validate = null; // TODO use Predicate::and
final Predicate<Person> validate = validateFirstName.and(validateLastName); // TODO use Predicate::and

assertEquals(true, validate.test(new Person("a", "b", 0)));
assertEquals(false, validate.test(new Person("", "b", 0)));
Expand Down