Question 77296 in Flutter Question posted in
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String to double from a map in Dart – Flutter

Ive tried to use double.parse, double.tryparse as well as trying to convert it to int but it keeps giving the error ‘type ‘int’ is not a subtype of type ‘String”, ive searched a few sites but all the solutions show to use parse.

final locData = Map<String, dynamic>.from(local);

var dubLat = locData['lat'];

var lat = double.tryParse(dubLat);

ive tried changing var to double nit still give the same error.

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2

Answers


  1. 0

    You are facing this error because you are trying to pass int but double.tryParse need string value that’s why getting this error ‘type ‘int’ is not a subtype of type ‘String’

    I solved by this ‘double.tryParse(dubLat.toString());’

    final locData = Map<String, dynamic>.from(local);

      var dubLat = locData['lat'];

      var lat = double.tryParse(dubLat.toString());
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  2. 0

    The .tryParse takes a string or even the parse method for this instance takes a string. But your data is actually integers therefore the error type int is not a subtype of type string. You should consider either storing them as ints or using the .toString method before parsing them.

    var dubLat = locData[‘lat’]; // Here dublat is not actually a string but integer. Your map has dynamic as a second parameter it can take all data types and this particular datatype is int not string which .parse expects.

    var lat = double.tryParse(dubLat.toString());

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