Working with nested collections using java 8 streams

Recently, I encountered a problem when using nested collections (maps values in list):

List<Map<String,Object>> items

In my case, this list contains 10 - 20 maps Sometimes I have to replace the value calculation of key description with rating So I came up with this solution:

items.forEach(e -> e.replace("description","Calculation","rating"));

If all mappings in this list contain key value pairs ["description", "calculation"], it will be a very fine and effective solution Unfortunately, I know there is only one such pair in the whole list < map < string, Object > >

The question is:

Is there a better (more efficient) solution to find and replace this value instead of iterating over all list elements using a java-8 stream?

Perfection would be to complete it in a stream without any complex / confusing operations

Solution

items.stream()

items.stream()
     .filter(map -> map.containsKey("description"))
     .findFirst()
     .ifPresent(map -> map.replace("description","rating"));

You will have to traverse the list until you find a map with the key "description" Pick up the first one and try to replace it

As @ Holger pointed out, if the key "description" is not single for all maps, but unique for ("description", "calculation"):

items.stream()
     .anyMatch(m -> m.replace("description","rating"));