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Nazarov_Anton/part-2 #163

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23 changes: 13 additions & 10 deletions src/test/java/lambda/part2/exercise/ArrowNotationExercise.java
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
package lambda.part2.exercise;

import data.Person;
import lambda.part2.example.FunctionCombination;
import org.junit.Test;

import java.util.function.BiFunction;
Expand All @@ -14,35 +15,37 @@ public class ArrowNotationExercise {
@Test
public void getAge() {
// Person -> Integer
final Function<Person, Integer> getAge = null; // TODO
final Function<Person, Integer> getAge = p -> p.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 = (o1, o2) -> o1.getAge() == o2.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 Function<Person, String> getFullName() {
return p -> p.getLastName() + " " + p.getFirstName();
}

// TODO
// ageOfPersonWithTheLongestFullName: (Person -> String) -> (Person, Person) -> int
//
private BiFunction<Person, Person, Integer> ageOfPersonWithTheLongestFullName(Function<Person, String> func) {
return (o1, o2) -> func.apply(o1).length() > func.apply(o2).length() ? o1.getAge() : o2.getAge();
}

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

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

assertEquals(
Integer.valueOf(1),
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31 changes: 10 additions & 21 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 +22,12 @@ 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 @@ -52,29 +45,25 @@ 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 = this.negate(hasEmptyFirstName);
final Predicate<Person> validateLastName = this.negate(hasEmptyLastName);

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

assertEquals(true, validate.test(new Person("a", "b", 0)));
assertEquals(false, validate.test(new Person("", "b", 0)));
Expand All @@ -86,10 +75,10 @@ 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)));
Expand Down