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Learn Dart: First Step to Flutter

Working with Maps

Get introduced to some of the properties and methods of a map in Dart.

We'll cover the following...

Just like lists and sets, maps are objects that have associated properties and methods. Let’s take a look at some of them below.

Adding Key-value pairs

To add a new key-value pair to a map that has already been declared, use the following syntax:

Dart
mapName[key]=value

Let’s add some key-value pairs to the numbers map we have declared in the widget below.

Dart
main() {
  var numbers = Map<int, String>();
  numbers[1] = 'one';
  numbers[2] = 'two';
  numbers[3] = 'three';
  print(numbers);
}

In the code snippet above, we added 3 key-value pairs to numbers.

Finding the number of pairs in a map

Just as we discussed for lists and sets, ...