CODEWITHSUNDEEP
flutterdart
Ricardo Schmitz
Ricardo Schmitz

Reputation: 43

Get value by key from Map in Flutter

I have the following Map

{
"Afghanistan": "A004",
"Albanien": "A008",
"Algerien": "A012",
"Amerikanisch-Samoa": "A016",
"Amerikanische Jungferninseln": "A850",
"Andorra": "A020" }

i'm Mapping it with

  final landcodes =
      Map<String, String>.fromIterables(countryList, codeList);

I am now trying to extract one value by providing one key with the following code:

 var value = landcodes.values.firstWhere((element) => landcodes[element] 
     == 'Andorra');

But everytime i get the following error-response:

Unhandled Exception: Unhandled error Bad state: No element occurred in Instance of 'AdressAenderungBloc'.
#0      Iterable.firstWhere (dart:core/iterable.dart:516:5)

Upvotes: 1

Views: 16357

Answers (2)

Nik official
Nik official

Reputation: 1

void main() {var details = new Map(); details['Usrname1'] = 'admin1';details['Password1'] = 'admin@123'; details['Usrname2'] = 'admin2';details['Password2'] = 'admin@123'; print('${details.keys}'); }

Upvotes: -2

SebastianK
SebastianK

Reputation: 782

I think you are mixing country and code. Retrieving the code based on the country:

var code = landcodes['Andorra'];

Or retrieving the country like this:

var country = landcodes.entries.firstWhere((entry) => entry.value
 == 'A020').key;

Upvotes: 9

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