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part2 completed #161

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3349768
part2 completed
whobscr Jul 4, 2017
634dbbd
code reformatting
whobscr Jul 4, 2017
f544419
fixes
whobscr Jul 5, 2017
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24 changes: 17 additions & 7 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 @@ -14,7 +14,7 @@ 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)));
}
Expand All @@ -23,26 +23,35 @@ public void getAge() {
public void compareAges() {
// TODO use BiPredicate
// compareAges: (Person, Person) -> boolean
BiPredicate<Person, Person> compareAges = (p1, p2) -> p1.getAge() == p2.getAge();

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

// TODO
// getFullName: Person -> String
public String getFullName(final Person p) {
return String.format("%s %s", p.getFirstName(), p.getLastName());
}

// TODO
// ageOfPersonWithTheLongestFullName: (Person -> String) -> (Person, Person) -> int
//
// ageOfPersonWithTheLongestFullName: (Person -> String) -> (Person, Person) -> Integer
public BiFunction<Person, Person, Integer> ageOfPersonWithTheLongestFullName(
final Function <Person, String> function) {
return (p1, p2) -> getFullName(p1).length() > function.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 =
ageOfPersonWithTheLongestFullName(getFullName);

assertEquals(
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@senia-psm senia-psm Jul 4, 2017

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Did you try to run this test?

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@deadwolfst deadwolfst Jul 5, 2017

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Fixed

Integer.valueOf(1),
Expand All @@ -51,3 +60,4 @@ public void getAgeOfPersonWithTheLongestFullName() {
new Person("aa", "b", 1)));
}
}

32 changes: 12 additions & 20 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 @@ -22,19 +22,13 @@ public void personHasNotEmptyLastNameAndFirstName0() {
// 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 @@ -54,27 +48,25 @@ public void personHasNotEmptyLastNameAndFirstName1() {

// TODO
// negate: (T -> boolean) -> (T -> boolean)
private <T> Predicate<T> negate(Predicate<T> test) {
// TODO
throw new UnsupportedOperationException();
private <T> Predicate<T> negate(final Predicate<T> test) {
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();
private <T> Predicate<T> and(final Predicate<T> t1, final Predicate<T> t2) {
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 = and(validateFirstName, 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 +78,10 @@ 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)));
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