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Kate Galushko
Kate Galushko

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What Are Dart Data Types in 2025?

Dart has become one of the most versatile programming languages due to its use in Flutter for building cross-platform applications. As of 2025, understanding Dart's data types is crucial for any developer looking to work efficiently with this robust language. This article delves into the various Dart data types, providing you with a foundational understanding to enhance your programming skills.

Basic Data Types in Dart

Dart offers a variety of data types, some of which are common to many programming languages, while others are more specific to Dart's needs. Here’s a breakdown of these types:

Numbers

Dart supports both integer and floating-point numbers.

  • int: Integers are numbers without a decimal point. For example, int age = 30;.
  • double: Doubles represent numbers with a decimal point. For instance, double price = 10.99;.

Strings

Strings in Dart are a sequence of UTF-16 code units. They can be declared using either single or double quotes.

String greeting = 'Hello, Dart!';
String language = "Dart is fun!";
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Booleans

This data type represents true or false values, useful in conditional expressions.

bool isActive = true;
bool isPromoted = false;
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Lists

Lists are an essential part of Dart for storing ordered collections of items.

List<String> cities = ['New York', 'Paris', 'London'];
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Maps

Maps store key-value pairs, allowing you to retrieve values based on a key.

Map<String, String> countryCapital = {
  'USA': 'Washington, D.C.',
  'France': 'Paris',
};
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Runes and Symbols

Runes represent Unicode characters, while Symbols refer to operators or identifiers in a Dart program.

var heartSymbol = '\u2665'; // Unicode for heart symbol
Symbol foo = #foo;
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Advanced Data Types

In 2025, advanced Dart data types include:

Sets

Sets store unique items, making them perfect for tasks where duplicates are not allowed.

Set<String> fruits = {'apple', 'banana', 'orange'};
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Future and Stream

These types are crucial for asynchronous programming in Dart.

  • Future: Represents a potential value or error that will be available at some point.
  • Stream: Provides a sequence of asynchronous data events. 
Future<String> fetchUserName() async {
  return 'John Doe';
}

Stream<int> generateNumbers() async* {
  yield 1;
  yield 2;
}
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Best Dart Programming Books to Buy in 2025

Product Price
Flutter Design Patterns and Best Practices: Build scalable, maintainable, and production-ready apps using effective architectural principles
Flutter Design Patterns and Best Practices: Build scalable, maintainable, and production-ready apps using effective architectural principles		 Add to Cart

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Flutter and Dart Cookbook: Developing Full-Stack Applications for the Cloud
Flutter and Dart Cookbook: Developing Full-Stack Applications for the Cloud		 Add to Cart

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Ultimate Flutter Handbook: Learn Cross-Platform App Development with Visually Stunning UIs and Real-World Projects (English Edition)
Ultimate Flutter Handbook: Learn Cross-Platform App Development with Visually Stunning UIs and Real-World Projects (English Edition)		 Add to Cart

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Dart Programming, In 8 Hours, For Beginners, Learn Coding Fast: Dart Language Crash Course Textbook & Exercises (Cookbooks in 8 Hours 3)
Dart Programming, In 8 Hours, For Beginners, Learn Coding Fast: Dart Language Crash Course Textbook & Exercises (Cookbooks in 8 Hours 3)		 Add to Cart

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Dart Programming, In 8 Hours, For Beginners, Learn Coding Fast: Dart Programming Language, Crash Course Tutorial, Quick Start Guide & Exercises
Dart Programming, In 8 Hours, For Beginners, Learn Coding Fast: Dart Programming Language, Crash Course Tutorial, Quick Start Guide & Exercises		 Add to Cart

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Conclusion

In 2025, mastering Dart's data types is essential for building powerful applications. Whether you're a beginner or an established developer, understanding these types enhances your ability to write efficient and effective Dart code.

Looking to deepen your coding skills further? Check out coding interview book discounts for great deals on resources that will prepare you for technical interviews. Interested in creative coding? Explore coding with p5.js to learn more about this fantastic tool. You can also expand your knowledge of various coding languages and strengthen your programming expertise.

By honing your skills in Dart and other programming languages, you'll be well-equipped to tackle any coding challenge that comes your way.

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