Assuming that list is a List in Slide 60, explain in detail the stream pipeline: listEmployees .stream() .filter(e-> e.getSalary() >=800 && e.getSalary() <1200) .map(e-> new Employee (e.getId(), e.getName(), e.getDepartment(), getSalary()*1.02)) .collect(Collectors. groupingBy(Employee::getDepartment, Collectors.counting())) .forEach((d, c) -> System.out.println("Dept: "+ d + ", Count: " + c));

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Map

A map is defined as the name of a higher-order function in most of the programming languages that applies a given function to each element of a functor, such as a list, and returns a list of results in the same order. A map is also called the collection of values based on a key, i.e. a key and value pair. A map has its own set of keys. Duplicate keys are not permitted in the Map, although duplicate values are permitted. Because a Map cannot be navigated, it must be converted to a Set using the keySet() or entrySet() methods. For key-value association mapping, such as dictionaries, maps are ideal.