What data structures exist in the Dart language?

The main data structures available in Dart are:

1. Numbers:

   • int (integer numbers up to 64 bits)
   • double (floating-point numbers)

2. Strings: A sequence of UTF-16 characters. Immutable.

   String greeting = 'Hello, Dart!';
   

3. Booleans: Represent true (true) or false (false).

   bool isFlutterAwesome = true;
   

4. Lists: Ordered collection of objects. Can be fixed-size or growable.

   List<int> ages = [25, 30, 22];
   List<String> names = ['Alice', 'Boris'];
   

5. Sets: Unordered collection of unique elements.

   Set<int> uniqueNumbers = {1, 2, 3, 2}; // Actually {1, 2, 3}
   

6. Maps: Collection of key-value pairs. Keys must be unique.

   Map<String, int> scores = {
     'Alice': 95,
     'Boris': 88,
   };
   

7. Runes: Represent Unicode code points in strings.

   Runes input = Runes('\u{1F600}');
   

8. Symbols: Used for reflection or obfuscation.

   Symbol libraryName = #mylibrary;
   

Besides these core types, Dart also provides more specific structures or abstractions, such as for working with data streams (Streams), asynchronous operations (Futures), etc., but they are not considered basic data structures in the traditional sense.