How to convert a List into a Map in Dart

Question

I looking for an on-the-shelf way to convert a List into a Map in Dart.

In python for example you can do:

l= [ (\'a\',(1,2)), (\'b\'         


        

Answer 1

In Dart 1.1, you can use this constructor of Map:

new Map.fromIterable(list, key: (v) => v[0], value: (v) => v[1]);

This would be closest to your original proposal.

Answer 2

Another possibility is to use the Map.fromEntries() constructor:

final result = Map.fromEntries(l.map((value) => MapEntry(value[0], value[1])));

Answer 3

You can use Map.fromIterable:

var result = Map.fromIterable(l, key: (v) => v[0], value: (v) => v[1]);

or collection-for (starting from Dart 2.3):

var result = { for (var v in l) v[0]: v[1] };

Answer 4

There is not yet a concept of tuples or pairs in dart (other than a two element Iterable). If Dart had such a concept, then issue 7088 proposes to solve this with a Map.fromPairs constructor.