https://twitter.com/AntonyMarcano/status/1096801224001810432

Combine.java

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class Combine {

    public static class Item {
        String name;
        long value;

        public String getName() {
            return name;
        }

        public long getValue() {
            return value;
        }
    }

    public List<Item> combine(List<Item> defaults, List<Item> overrides) {
        Map<String, Item> overridesByName = overrides.stream()
                                                     .collect(Collectors.toMap(Item::getName,
                                                                               i -> i,
                                                                               (older, newer) -> newer,
                                                                               LinkedHashMap::new));

        return defaults.stream()
                       .map(i -> overridesByName.getOrDefault(i.getName(), i))
                       .collect(Collectors.toCollection(ArrayList::new));
    }

}