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package fp; import java.math.BigDecimal; import java.util.ArrayList; import java.util.Comparator; import java.util.Map; import java.util.function. * ; import java.util.stream.Collectors; import java.util.List; class ExerciseNotCompletedException extends RuntimeException { public ExerciseNotCompletedException

package fp;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Map;
import java.util.function.*;
import java.util.stream.Collectors;
import java.util.List;
class ExerciseNotCompletedException extends RuntimeException {
public ExerciseNotCompletedException(){
super("Exercise is not completed yet");
}
}
/**
*{@link HW} is an exercise class. Each method returns a functional interface and it should be implemented
* using either lambda or a method reference. Every method that is not implemented yet throws
*{@link ExerciseNotCompletedException}.
*
* TODO: remove exception and implement each method of this class using lambda or method reference
*
/**
* Returns a {@link BiFunction} that has two parameters. First is {@link IntUnaryOperator} which is some integer function.
* Second is {@link IntPredicate} which is some integer condition. And the third is {@link IntUnaryOperator} which is
* a new composed function that uses provided predicate (second parameter of binary function) to verify its input
* parameter. If predicate returns {@code true} it applies a provided integer function
*(first parameter of binary function) and returns a result value, otherwise it returns an element itself.
*
* @return a binary function that receiver predicate and function and compose them to create a new function
*/
public static BiFunction functionToConditionalFunction(){
throw new ExerciseNotCompletedException();
}

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