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Learn Dart

The typed, null-safe language behind every Flutter app.

Free to start. Built from a single prompt. No credit card.

Dart is a client-optimized language from Google, best known as the language of Flutter. It has C-style syntax that feels familiar to Java, JavaScript and C# developers, sound null safety that separates String from String?, and classes with mixins and extension methods. Dart compiles ahead of time to native code for release builds, and it also supports fast just-in-time compilation for development and compiles to JavaScript and WebAssembly for the web. Async code uses Futures, Streams and async and await. Learnr builds a personalized Dart course from one prompt and teaches it in short interactive lessons.

How to learn Dart, step by step

Start in DartPad, then install the SDK. DartPad runs Dart in the browser with no setup, which is ideal for the first week. Then install the Dart SDK, or Flutter, which bundles it, and run dart create and dart run on your machine.
Learn final, const and null safety. Use final for values set once and const for compile-time constants. Practice nullable types like int?, the ?? fallback and null-aware access with ?. so the compiler catches null errors before runtime.
Practice collections and functional methods. Filter and transform a list of products with where, map and fold, and try collection if and spread syntax inside list literals. These patterns appear constantly in Flutter widget code.
Write classes the Dart way. Use named constructors, initializer lists and named parameters with required. Add a mixin and an extension method to see how Dart shares behavior without deep inheritance.
Master async and await. Fetch JSON with the http package, decode it with dart:convert and handle errors with try and catch. Then listen to a Stream to understand data that arrives over time.
Move on to Flutter or a CLI tool. Build a command-line quiz or jump into Flutter, where most Dart is written today. A quick daily Learnr lesson keeps syntax like null-aware operators sharp.

What you'll learn

Write Dart with var, final, const and type inference
Use sound null safety with ?, ! and the ?? operator
Build classes with constructors, mixins and extension methods
Work with List, Map and Set using collection methods
Write asynchronous code with Future, Stream, async and await

What's inside your Dart course

A sample path Learnr builds for Dart. Your real course adapts to your goal and level.

1. DartPad, variables and types
2. Functions, control flow and null safety
3. Collections and collection methods
4. Classes, constructors, mixins and records
5. Futures, Streams and error handling
6. Packages from pub.dev and a command-line app

How long does it take to learn Dart?

Programmers coming from Java, JavaScript or C# usually pick up Dart in 1 to 3 weeks. Complete beginners need about 1 to 2 months at 5 hours a week before moving on to Flutter comfortably.

What you need before you start

No prior language is strictly required, though basic programming ideas like variables and loops make it faster. A computer that can run the Dart or Flutter SDK.

Common mistakes to avoid

Sprinkling the ! operator everywhere to silence null errors, which just moves the crash to runtime. Handle null with checks or ?? instead.
Forgetting to await a Future, so code runs before data arrives. Watch for unawaited calls and enable the related lint rules.
Learning Dart only through Flutter widgets and never the core language. A week of plain Dart makes Flutter code far easier to read.

How Learnr builds your course

Type your topic

Tell Learnr you want to learn Dart, or get as specific as you like.

Get a personalized course

Learnr instantly builds a full Dart course tailored to your goal and skill level.

Learn and level up

Move through bite-sized lessons and interactive practice, earning XP and keeping your streak.

Dart questions, answered

Should I learn Dart before Flutter?

Learn enough Dart to be comfortable with classes, null safety and async first. Many people then learn the rest alongside Flutter, which is the main reason most developers pick up Dart.

Is Dart used outside Flutter?

Yes, for command-line tools and server code, and it compiles to JavaScript for the web. Flutter is still by far its most common use.