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Golubev Nikita - part2 #186

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2bd629c
[WIP] part2
Jul 5, 2017
1d04f94
part2 is done
Jul 9, 2017
31e3b40
part2
Jul 11, 2017
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27 changes: 14 additions & 13 deletions src/test/java/lambda/part2/exercise/ArrowNotationExercise.java
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Original file line number Diff line number Diff line change
Expand Up @@ -14,40 +14,41 @@ public class ArrowNotationExercise {
@Test
public void getAge() {
// Person -> Integer
final Function<Person, Integer> getAge = null; // TODO
final Function<Person, Integer> getAge = Person::getAge;

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

@Test
public void compareAges() {
// TODO use BiPredicate
// compareAges: (Person, Person) -> boolean
final BiFunction<Person, Person, Boolean> compareAges = (person1, person2) -> person1.getAge() == person2.getAge();

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

// TODO
// getFullName: Person -> String
private String getFullNameFunc(Person person){
return String.format("%1%s %2$s", person.getFirstName(), person.getLastName());
}

// TODO
// ageOfPersonWithTheLongestFullName: (Person -> String) -> (Person, Person) -> int
//

private BiFunction<Person, Person, Integer> ageOfPersonWithTheLongestFullNameFunc(Function<Person, String> getFullNameFunc){
return (person1, person2) -> getFullNameFunc.apply(person1).length() > getFullNameFunc.apply(person2).length()?
person1.getAge():person2.getAge();
}
@Test
public void getAgeOfPersonWithTheLongestFullName() {
// Person -> String
final Function<Person, String> getFullName = null; // TODO
final Function<Person, String> getFullName = this::getFullNameFunc;

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

assertEquals(
Integer.valueOf(1),
ageOfPersonWithTheLongestFullName.apply(
new Person("a", "b", 2),
ageOfPersonWithTheLongestFullName.apply(new Person("a", "b", 2),
new Person("aa", "b", 1)));
}
}
32 changes: 10 additions & 22 deletions src/test/java/lambda/part2/exercise/FunctionCombinationExercise.java
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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 p -> !test.test(p);
}

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

@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);
final Predicate<Person> validateLastName = negate(hasEmptyLastName);

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

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();
final Predicate<Person> validateLastName = hasEmptyLastName.negate();

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

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