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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"}; 
676
concat() Alternatively, we can use Stream#concat() function to merge the maps together. This function can combine two different streams into one. As shown in the snippet, we are passed the streams of map1 and map2 to the concate() function and then collected the stream of their combined entry elements.
If you want to combine two My Maps custom maps: Go to first map and select "Add a New Layer" Go to the second map and in the top menu ( three dots) and choose Export to kml-->save the file to your computer. Go to first map, click into the new layer and choose Import--> import the kml file you previously saved.
You can't merge maps. The only way to fully explore a map is to manually explore all the terrain shown on the map while holding that map.
As we know hashmap does not allow duplicate keys. So when we merge the maps in this way, for duplicate keys in firstMap the value is overwritten by the value for the same key in secondMap . Let's take an example. //map 1 HashMap<Integer, String> firstMap = new HashMap<>(); firstMap.
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); Since dart sdk 2.3 You can use spread operator ...
final firstMap = {"1":"2"}; final secondMap = {"2":"3"}; final thirdMap = { ...firstMap, ...secondMap, }; If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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