Combine/merge multiple maps into 1 map

Question

How can I combine/merge 2 or more maps in dart into 1 map? for example I have something like:

 var firstMap = {"1":"2"};  var secondMap = {"1":"2"};  var thirdMap = {"1":"2"}; 

I want:

 var finalMap = {"1":"2", "1":"2", "1":"2"}; 

Answer 1

you can use addAll method of Map object

var firstMap = {"1":"2"}; var secondMap = {"2":"3"};  var thirdMap = {};  thirdMap.addAll(firstMap); thirdMap.addAll(secondMap);  print(thirdMap); 

Or

var thirdMap = {}..addAll(firstMap)..addAll(secondMap); 

Update

Since dart sdk 2.3 You can use spread operator ...

final firstMap = {"1":"2"}; final secondMap = {"2":"3"};  final thirdMap = {    ...firstMap,    ...secondMap, };