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] };
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] };