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Dart Map

Dart Map is very similar to Java Map.

Create Map​

Create a map with initial elements.

Map<String, int> m = {'a': 1, 'b': 2};

Create an empty map.

Map<String, int> m = {};
// Or
var m = new Map<String, int>();

Add element​

Add element to a map using [key]=.

Map<String, int> m = {};
m['a'] = 1;

Check if key exists​

Check if key exists in a map using containsKey.

Map<String, int> m = {'a': 1, 'b': 2};
m.containsKey('a'); // true

You can also check if value exists in a map using containsValue.

Iterate map​