I have this map: Map<String, String> myMap = new HashMap<>(); I’m trying to check if this map has a key called "Brian". If – and only if – it does, I want to replace the value with "Hello". If I understand correctly the computeIfPresent method does exactly that, but it expects a remappingFunction as the… Read More How do I replace value of Map if the key is present?

My code compiles but the app will not start now. I’ve tried many variations to simply get a user’s current location and display it using MapsSDK but nothing works. Fragment Activity: class BuyFragment : Fragment(), OnMapReadyCallback { private var _binding: FragmentBuyBinding? = null private val binding get() = _binding!! private lateinit var map: GoogleMap private… Read More App crashes when getting current user's location (Kotlin)

Given the following key… private class PositionKey { String assetId; String currencyId; } … I need to create a Map<PositionKey, BigDecimal>, where if a given key does not exist, then a new entry shall be added, otherwise, if a given key already exists, then its values shall be increased. Here below is my attempt: public… Read More Java Stream: How to Sum Value If Element Already Exists

PROBLEM I have a map that looks like this: const myMap= new Map(); myMap.set("MapItem1", [1, 4.5]); myMap.set("MapItem2", [0, 3]); myMap.set("MapItem3", [1, 10]); myMap.set("MapItem4", [1, 1]); As you can see, this map has 1 key, and an array with 2 values. What I’m trying to do is get the sum of all the second values. Solution… Read More How do I get the sum of all values in a map with multiple values?

So I’ve got a map with a string key and either a string or vector value. I want to cycle through all the string values (whether they’re found in a vector or they can be directly checked) in the map and check if they match a given string (it’s irrelevant what the string is). If… Read More Getting a substr from a std::variant<std::string, std::vector<std::string>>> in C++

Hello i am trying to sort a map in flutter and i have encountered several methods but none have helped so far. { 11-Mittwoch: 07:20:58-07:21:03-23:44:37-00:00:00, 15-Sonntag: 11:11:02-11:11:32-00:00:29-00:00:00, 10-Dienstag: 07:36:20-07:20:53-23:44:32-00:00:00, 28-Samstag: 15:32:18-15:32:21-00:00:01-00:00:01, 30-Montag: 08:25:50-16:28:57-08:03:06-00:00:00, 1-Sonntag: 20:39:11-20:39:33-00:00:15-00:00:06, 3-Dienstag: 17:30:14-17:30:19-00:00:04-00:00:00, 18-Mittwoch: 07:54:51-17:38:01-09:43:09-00:00:00, 5-Donnerstag: 08:17:11-22:07:50-03:45:09-10:05:28, 17-Dienstag: 07:00M-15:20M-7:00M-1:00M, 9-Montag: 18:10:28-18:10:32-00:00:04-00:00:00, 6-Freitag: 07:36:54-14:56:13-07:19:19-00:00:00, 2-Montag: 08:28:39-15:44:11-04:21:33-01:05:34} as you can see from the… Read More how to sort a map in flutter by it's key

Hi so i have an array of integers and i have to put it into a map key is number of digits. I know i should use stream groupingBy but i have a problem. i have this piece of code: public static Map<Integer, List<String>> groupByDigitNumbers( List<Integer> x){ return x.stream() .collect(Collectors.groupingBy(n->Integer.toString(n).length())); } but my values should… Read More I need to put an array of integers into a map, key is number of digits using stream

So I am trying to create a distribution map of the different subspecies of an animal. I wanted to color each country differently, according to the subspecies that can be found there. But when I try to color a new country, the first one in the code will get erased by the new one. For… Read More Color different countries with R based on ggplot and map_data