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package com.javatechie.map_reduce;

import java.util.Arrays;

import java.util.List;

import java.util.Optional;

public class MapReduceExample {

public static void main(String[] args) {

List<Integer> numbers = Arrays.asList(3, 7, 8, 1, 5, 9);

List<String> words = Arrays.asList("corejava", "spring", "hibernate");

int sum = 0;

for (int no : numbers) {

sum = sum + no;

}

System.out.println(sum);

int sum1 = numbers.stream().mapToInt(i -> i).sum();

System.out.println(sum1);

Integer reduceSum = numbers.stream().reduce(0, (a, b) -> a + b);

System.out.println(reduceSum);

Optional<Integer> reduceSumWithMethodReference = numbers.stream().reduce(Integer::sum);

System.out.println(reduceSumWithMethodReference.get());

Integer mulResult = numbers.stream().reduce(1, (a, b) -> a * b);

System.out.println(mulResult);

Integer maxvalue = numbers.stream().reduce(0, (a, b) -> a > b ? a : b);

System.out.println(maxvalue);

Integer maxvalueWithMethodReference = numbers.stream().reduce(Integer::max).get();

System.out.println(maxvalueWithMethodReference);

String longestString = words.stream()

.reduce((word1, word2) -> word1.length() > word2.length() ? word1 : word2)

.get();

System.out.println(longestString);

//get employee whose grade A

//get salary

double avgSalary = EmployeeDatabase.getEmployees().stream()

.filter(employee -> employee.getGrade().equalsIgnoreCase("A"))

.map(employee -> employee.getSalary())

.mapToDouble(i -> i)

.average().getAsDouble();

System.out.println(avgSalary);

double sumSalary = EmployeeDatabase.getEmployees().stream()

.filter(employee -> employee.getGrade().equalsIgnoreCase("A"))

.map(employee -> employee.getSalary())

.mapToDouble(i -> i)

.sum();

System.out.println(sumSalary);

}

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