How to merge new elements into a List in Gosu

Question

Eg I have a List of objects, List A, and its initialized with 7 elements. Each element is ordered by an integer field called "elementOrder".

How can I take a new List of the same objects, List B, and merge them into List A based on the "elementOrder"?

Note that List B contains duplicates of List A and I only want to merge unique elements of List B into List A.

Thanks you. S

Answer 1

//copy ListA element on a new list 
var newList = new ArrayList<ElementType>(ListA)
//add B elements to new list 
newList.addAll(ListB)
//order the new list with elementOrder column
newList = newList.orderBy( \ element -> element.elementOrder) 

Q : List B contains duplicates of List A and I only want to merge unique elements of List B into List A

R : you must use Blocks (lambda expressions) to filter duplicates elements

//copy ListA element on a new list 
var newList = new ArrayList<ElementType>(ListA)
//filter B elements not in ListA
var FiltredListB = ListB.where( \ element -> not ListA.contains(element))
//add FiltredListB elements to new list 
newList.addAll(FiltredListB)
//order the new list with elementOrder column
newList = newList.orderBy( \ element -> element.elementOrder)