Add list to list Dart

When a user is receiving a data from two different source in a list format user need to concatenate two lists in a dart to create a brand new list object. So in todays article, we will go through How to Combine Two Lists In Dart.

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How to Combine Two Lists In Dart??

Consider a case where is having a two list like a below:

list1 = [1, 2, 3] list2 = [4, 5, 6]

and the user wants to get a combined output like a below:

[1, 2, 3, 4, 5, 6]

In order to combine the two lists, you can give it a try at the below code snippet.

var newList = new List.from[list1]..addAll[list2];

If you have several lists you can use:

var newList = [list1, list2, list3].expand[[x] => x].toList[]

As of Dart 2, you can now use +

var newList = list1 + list2 + list3;

As of Dart 2.3, you can use the spread operator:

var newList = [...list1, ...list2, ...list3];

Darts operator overloading:

class MyList{ List _internal = new List[]; operator +[other] => new List.from[_internal]..addAll[other]; noSuchMethod[inv]{ //pass all calls to _internal } }

Then use this:

var newMyList = myList1 + myList2;

Maybe more consistent as sown below

var list = []..addAll[list1]..addAll[list2];

Dart now supports the concatenation of lists using the + operator.

You can refer to the below Example:

List result = [0, 1, 2] + [3, 4, 5];

If you want to merge two lists and remove duplicates could do:

var newList = [...list1, ...list2].toSet[].toList[];

Conclusion:

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So in this article, we have been through how to combine two lists in Dart.

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