list.replaceAll(lambda) -- calls the lambda once for each item in the list, storing the result back into the list (or other type of collection).
  e.g. nums.replaceAll(n -> n * 2);
  
  list.removeIf(lambda) -- calls the lambda once for each item in the collection, removing each item where the lambda returns true.
  e.g. nums.removeIf(n -> n < 0);
  
  Simple Lambda Examples -- the data types are inferred from the context and from the type of the expression following the "->":
        n -> n * 2 -- takes Integer, returns Integer
        n -> n < 0 && n >= -10 -- takes Integer, returns boolean
        s -> s.length()  -- takes String, returns Integer
        s -> s.startsWith("hi") -- takes String, returns boolean
  
  The Java stream system provides more complicated lambda features. The stream calls do not modify the original list, returning a new data structure of the results. Note that the boolean logic of filter() is the opposite of removeIf().
  
    List<Integer> nums = -something-;
        nums = nums.stream()
          .map(n -> n * 2)
          .filter(n -> n >= 0)
          .collect(Collectors.toList());