assignment

package prob2;

import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class LambdaLibrary {
	public final static String IMPLEMENT = "implement!";

	// sample query
	public final static TriFunction<List<Employee>, Integer, Integer, List<Employee>> SAMPLE = (
			list, namelength, year) -> list.stream()
			.filter(e -> e.getName().length() > namelength)
			.filter(e -> e.getYearOfBirth() > year)
			.collect(Collectors.toList());


	// int[] testItem1 = {-351, 2342, 46, 17, 14, 4002, 12};
	//Extract subarray of even integers from an array of integers

	public final static Function<int[],List<Integer>> CHANGE_TO_LIST = x->IntStream.of(x).boxed().collect(Collectors.toList());

	public final static Function<List<Integer>,List<Integer>>  GET_SUBSTRING = (x)->	x.stream()
			.filter(y->{return y%2==0;}).collect(Collectors.toList());

//	int[] testItem2 = {-1, -3, 5, 11, 213};
//	//Compute sum of squares of an input array of integers

	public final static Function<List<Integer>, Integer> SUM_OF_SQUARE = x->x.stream()
			.mapToInt(y->(int)Math.pow(y, 2)).sum();

	// 	//Find all transactions from year 2011 and sort them by value (small to high).
	public final static Function<List<Transaction>,List<Transaction>> FOR_YEAR_2011= (List<Transaction> x)-> x.stream()
			.filter(x-((Transaction) x).getYear()==2011)


}