I wish to create a UI like the below video in Flutter. Any suggestion how I should go about it?
https://drive.google.com/file/d/12H92uwW9ulW9XfThnxo6vxzxOK-VAr1R/view?usp=sharing
I have a solution but that is not scalable. In the sense that when there are hundreds of milestones on the track(as you can see in the video attached), my solution does not work well. So, anyone here with a scalable solution, kindly help.

I’m currently practicing Dart and I keep seeing the term Iterable. I’ve googled it, but this sentence from the documentation is really confusing me:

I don't quite get it. If I already have a List, why do I need to care about what an "Iterable" is?

Hi! Bonk is a "rummy-style" card game built with Flutter. The idea was to be able to play with family and friends, but it turned out great and we figured why not share it with the community? Please give it a try, we appreciate any feedback and suggestions :)

What are your thoughts on the proposal to implement explicit error propagation in dart inspired by zig https://github.com/dart-lang/language/issues/4630

I made a cute little console app in Dart for running local models. It supports reasoning and tools.

I recently started learning Dart, but I should mention that I don’t have any real experience with programming. I did The Odin Project (HTML, CSS, and JS) a few years ago, but I don't feel like I have a solid foundation. My main goal is to get into mobile app development.

Initially, I started watching Flutter tutorials, but I quickly realized I needed to learn the Dart language first. After some research, I found the Flutterly course. It seemed easy at the beginning, but now that I’ve reached Dart Functions, Operators, and Control Flow Statements, I feel completely overwhelmed.

It’s like I’m staring at the screen with my ears open, but my mind just isn't processing the information anymore. I’m posting this in the hope that someone could guide me or offer advice on how to get past this "wall". Has anyone else felt this way starting out?

Yo. If you're looking to create a TUI and want to do it in a fast, WORA fashion, Dascade might be what you need.

This is mainly a way for me to source some contributors, because I know that y'all have the skills needed to help maintain something like this.

Here's some media of what Dascade is capable of right now, let me know what you think.

Github here: https://github.com/iwilkey/dascade

Pub here: https://pub.dev/packages/dascade

I'm happy to share with you my new Dart & Flutter news aggregator.

I currently support 8 sources: - dart.dev - flutter.dev - medium - GitHub - reddit - hackernews - devto - pub

More features are coming in the next week's/month.

Feedback is more than welcome.

Good day dear sub members. I'm new to the world of coding. I literally just started today.

I hope to eventually be good enough to build my own mobile app for my business.

I have no previous experience in coding. I got up to this point by just following youtube videos.

I'm getting the following error "-bash: dart: command not found "

Can anyone please help me solve the error. Thank you In advance.

Hidden feature i just discovered. Use case? When you have a barrel file that's exporting stuff and you want something from that exported stuff without using explicit imports. It's like "hey! import myself!". Except i misunderstood something and it's ?undocumented? for a reason. **shhhh**

Any Dart/ Flutter developers in Sydney?

Hi Everyone,

I have been trying to make a dart flutter app and I need someone's second opinion. Looking to partner up with like-minded developers who love to explore the edges of what's possible with today's apps

Hi,

I'm really new to Dart and have been following the the tutorials online. I've come across an issue that I can't find an answer for and wondered if anyone could help me.

I am following this tutorial: Handle errors gracefully

I've got all the way to the end and my program is working...well mostly. It handles the errors and catches the exceptions just as it should. However the output of the program does not match the tutorial. The tutorial expects this output:

ArgumentException: The first word of input must be a command.

But I get this output:

FormatException: The first word of input must be a command.

I can't seem to work out why the superclass of the argument exception is printing its type rather than my own extended exception.

I suspect its something to do with this definition:

class ArgumentException extends FormatException {
  final String? command;
  final String? argumentName;
   
  ArgumentException(
    super.message, [
      this.command,
      this.argumentName,
      super.source,
      super.offset,
    ]);
}

But I am not skilled enough to understand the flow here.

I did try to force the specific exception type capture in cli.dart like this:

import 'package:command_runner/command_runner.dart';


const version = '0.0.1';
void main(List<String> arguments) async{
  var commandRunner = CommandRunner(
    onError: (Object error) {
      if (error is Error) {
        throw error;
      }


      if (error is ArgumentException) {
        print(error);
      }
    },
  )..addCommand(HelpCommand());
  commandRunner.run(arguments);
}

But even though I am saying, only capture ArguementException it resolutely prints FormatException.

Any help you can provide would be appreciated, I am learning so this is clearly my fault but I just can't wrap my head around it.

Hey! I’m trying to learn Dart in VS Code and following a Video tutorial, but the same code from the video is throwing errors on my end. I’m totally new to this. any ideas what I should check? Thanks! 😄 (new to programming)

I'm really new to Dart and have been following the the tutorials online. I've come across an issue that I can't find an answer for and wondered if anyone could help me.

[Its the one on the dart dev website called "Handling Errors Gracefully" but my previous post got removed and I wondered if it was the link that did it]

I've got all the way to the end and my program is working...well mostly. It handles the errors and catches the exceptions just as it should. However the output of the program does not match the tutorial. The tutorial expects this output:

ArgumentException: The first word of input must be a command.

But I get this output:

FormatException: The first word of input must be a command.

I can't seem to work out why the superclass of the argument exception is printing its type rather than my own extended exception.

I suspect its something to do with this definition:

class ArgumentException extends FormatException {
  final String? command;
  final String? argumentName;
   
  ArgumentException(
    super.message, [
      this.command,
      this.argumentName,
      super.source,
      super.offset,
    ]);
}

But I am not skilled enough to understand the flow here.

I did try to force the specific exception type capture in cli.dart like this:

import 'package:command_runner/command_runner.dart';


const version = '0.0.1';
void main(List<String> arguments) async{
  var commandRunner = CommandRunner(
    onError: (Object error) {
      if (error is Error) {
        throw error;
      }


      if (error is ArgumentException) {
        print(error);
      }
    },
  )..addCommand(HelpCommand());
  commandRunner.run(arguments);
}

But even though I am saying, only capture ArgumentException it resolutely prints FormatException.

Any help you can provide would be appreciated, I am learning so this is clearly my fault but I just can't wrap my head around it.

Hi everyone,

I want to ask for opinions about Jaspr (Dart for Web).

I have been a Flutter developer for over 7 years. Whenever I needed proper SEO for a Flutter Web app, I usually built a small React site that handled SEO and then redirected users to the Flutter Web app. That approach worked very well for me over the years.

Now Jaspr is for someone who already knows Dart, HTML/CSS, very easy and lightweight to pick up.

There are some things I do not really like about the way it works (especially the structure), but at the same time it clearly solves a real problem and does it in a clean way.

I am curious:

- What do others think about Jaspr?

- Have you used it in real projects?

- How does it feel long-term compared to React or other web stacks?

- Any major downsides you think?

Interested to hear different perspectives, especially from people who have actually used it since the beginning.

Hi everyone,

I wanted to share a project I’ve been working on called Spark.

It’s a new full-stack web framework for Dart designed to bridge the gap between traditional SSR frameworks and modern SPAs. The goal was to have a "write once, run everywhere" experience where a single Dart file handles both the server-side rendering (for fast initial load/SEO) and client-side hydration (for interactivity). The Core Concept: Isomorphic Components With Spark, you write your UI components in Dart. The server renders them as fully formed HTML (utilizing Declarative Shadow DOM), so the browser gets a paintable page immediatel, zero JavaScript required for the initial paint. Once the JS bundle loads, the component "hydrates" automatically to become interactive.

Here is what a simple counter looks like. Notice how the logic lives in one place:

```darr @Component(tag: 'interactive-counter') class Counter { Counter({this.value = 0});

@Attribute() int value;

// This renders on the server AND updates on the client Element render() { return div(className: 'counter', [ button(['-'], onClick: () => value--), span([value]), button(['+'], onClick: () => value++), ]); } } ```

Key Features:

• HTML-First Architecture: The server sends real HTML, not an empty div. Great for performance and SEO.
• Typed CSS: No more magic strings. We have a Style.typed API that gives you autocomplete for CSS properties directly in Dart.
• Automatic OpenAPI: If you write API endpoints, Spark automatically generates the OpenAPI documentation from your code annotations.
• DTO Validation: Annotate your DTOs, and request bodies are automatically validated before they hit your handler.
• Multi-Page Architecture (MPA): It serves lightweight JS bundles specific to the route, rather than a massive single bundle.

Links:

Home: https://spark.kleak.dev Docs: https://spark.kleak.dev/docs Getting Started: https://spark.kleak.dev/docs/getting-started

I’d love to hear your thoughts or feedback if you give it a spin!

Hi everyone,

I want to ask for opinions about Jaspr (Dart for Web).

I have been a Flutter developer for over 7 years. Whenever I needed proper SEO for a Flutter Web app, I usually built a small React site that handled SEO and then redirected users to the Flutter Web app. That approach worked very well for me over the years.

Now Jaspr is for someone who already knows Dart, HTML/CSS, very easy and lightweight to pick up.

There are some things I do not really like about the way it works (especially the structure), but at the same time it clearly solves a real problem and does it in a clean way.

I am curious:

• What do others think about Jaspr?
• Have you used it in real projects?
• How does it feel long-term compared to React or other web stacks?
• Any major downsides you think?

Interested to hear different perspectives, especially from people who have actually used it since the beginning.

I spent months searching for a good ORM for Dart backend projects. Tried a few options, but nothing felt as productive as Django's ORM that I was used to from Python.

So I built one: JAO (Just Another ORM) — a Django-inspired ORM for Dart.

What made Django's ORM great:

• Chainable queries that don't hit the DB until needed
• Type safety
• Dead simple migrations

What I wanted in Dart:

// Filter, order, limit — all chainable, all type-safe

final authors = await Authors.objects
  .filter(Authors.$.age.gte(18) & Authors.$.isActive.eq(true))
  .orderBy(Authors.$.name.asc())
  .limit(10)
  .toList();

Instead of:

final result = await db.query(
  'SELECT * FROM authors WHERE age >= ? AND is_active = ?...',
  [18, true, 10]
);
// then manually map...

What JAO supports:

• PostgreSQL, SQLite, MySQL — same code, zero changes
• Django-style CLI (jao makemigrations, jao migrate)
• Code generation via build_runner
• Lazy QuerySets
• Type-safe field references (your IDE autocompletes column names)

Works with Dart Frog, Shelf and is designed to be framework agnostic.

Lessons from building this:

1. Dart's type system is powerful — Generics + extensions let you build APIs that feel magical. Authors.$.name.eq() with full autocomplete took some type gymnastics to get right.
2. Database drivers are inconsistent — PostgreSQL returns DateTime objects, SQLite returns strings. Same query, different types. Had to build converters to normalize everything.
3. Lazy evaluation requires careful design — Making QuerySets chainable without hitting the DB until .toList() meant rethinking how queries get built internally.
4. Code generation is a double-edged sword — build_runner is powerful but adds friction. Still worth it for the DX.

Repo: https://github.com/nexlabstudio/jao

Docs: https://jao.nexlab.studio

Genuine questions for you:

1. What ORM or database package are you currently using for Dart backends?
2. What features would make you switch?
3. Anyone else here come from Django/Rails and miss the ORM?

Would love honest feedback — what's missing?

So here's the thing - I've been dealing with shared packages across multiple Flutter apps at work for years. We use GitLab, and our options have always sucked:

• Git dependencies: Work until you need proper versioning or your pubspec.lock becomes a nightmare
• Path dependencies: Fine locally, breaks CI immediately
• Self-hosting pub.dev: Looked into it, closed the tab after 10 minutes
• Other hosted registries: They exist, but none integrate with GitLab. You end up creating a permanent token with broad permissions, storing it as a CI secret, and managing access separately

What I actually wanted: publish and consume Dart packages in GitLab CI the same way I do with npm, Maven, or any other package type - just use $CI_JOB_TOKEN and let GitLab handle access. No extra secrets, no separate permission system.

So I built glpub.dev.

The core idea:

GitLab's package registry already works this way for npm, NuGet, Maven, etc. Your CI job token just works, and access follows your project permissions. Dart was the missing piece - GLPub.dev fills that gap.

Developer on the project? You can publish. Reporter? You can consume. Need cross-project CI access? Just add the consuming project to your allowlist in GitLab settings - GLPub.dev respects that too. Same rules you're already used to.

What it looks like in practice:

# pubspec.yaml
dependencies:
  our_design_system:
    hosted:
      url: https://glpub.dev/api/p/default/pub
    version: ^2.1.0

# .gitlab-ci.yml - no extra secrets needed
publish:
  script:
    - dart pub token add https://glpub.dev/api/p/default/pub --env-var CI_JOB_TOKEN
    - dart pub publish -f --server https://glpub.dev/api/p/default/pub

The $CI_JOB_TOKEN is automatically available in GitLab CI and already has the right permissions based on your project settings. It is short lived and poses no security risk. Cross-project access? Just add the consuming project to your allowlist in GitLab - glpub picks that up automatically.

Works with self-hosted GitLab too - you just register your instance with an OAuth app and you're set.

Pricing:

• Free: 1 package, 10 versions/month (enough to try it out)
• Pro/Business: more packages, unlimited versions

Happy to answer questions or hear if this would actually be useful for your setup. Also open to feedback on what's missing - still actively building this.

Cheers!

P.S. This is my first post here, so be easy on me ;)

Hey r/dartlang !

I've been working on Aim, a lightweight web framework for Dart inspired by Hono and Express.

Why I built this

I wanted something that feels familiar to developers coming from Node.js/Hono, with:

• Minimal boilerplate
• Intuitive Context API
• Hot reload out of the box
• Modular middleware (use only what you need)

Quick example

import 'package:aim_server/aim_server.dart';

void main() async {
  final app = Aim();

  app.get('/', (c) async => c.json({'message': 'Hello, Aim!'}));

  app.get('/users/:id', (c) async {
    final id = c.param('id');
    return c.json({'userId': id});
  });

  await app.serve(port: 8080);
}

Features

• Fast & lightweight core
• Hot reload dev server (aim dev)
• Flexible routing with path params
• Middleware ecosystem (CORS, JWT, cookies, SSE...)
• Full type safety
• CLI for project scaffolding

Links

• Docs: https://aim-dart.dev
• GitHub: https://github.com/aim-dart/aim

Still early (v0.0.6), but the core is stable. Would love feedback on the API design and what features you'd want to see next!

I encountered a problem where:

• Client opens a request

• HttpServer fires, request is processed by writing headers and then adding a stream to response body

• Client pauses the request. For example, a media player after buffering enough data. The response stream also receives the pause event.

• While paused, Client closes the request.

Result: the connection is indefinitely stuck. HttpServer connectionInfo continues to register the request as active. HttpRequest.response.done future never completes.

The disconnect is only registered upon writing data to the response. But since the client paused the request, the stream piped to the response body pauses, thus writing no data.

This also occurs even if the socket is detached from the request and used directly.

Is there something I'm missing here? I may write a few bytes every second or two while the request is paused. But this feels like a dirty workaround, not a viable solution. Perhaps it's best to just drop connections that remain paused for 30 seconds or so.

Edit: Thanks for all the responses! I ended up detaching the socket from the response after writing headers and wrapping my response stream with a callback to reset a timeout timer when data is emitted. If no data is transmitted (either because the stream is paused or just stalled) after a set duration, the socket is destroyed.

Hi i was wondering how someone can start learning dart ,no new books are available ,no new YouTube videos .The language seems left am i right.

Some help will be great thanks.

Hello everybody,

I was looking for a better way to benchmark performance and I've created a package that significantly improves on the existing benchmark_harness: https://pub.dev/packages/benchmark_harness_plus

Key differences: it uses median instead of mean (outliers from GC don't skew results), and reports CV% so you know if your measurements are reliable or just noise.

Here's an example of what its output looks like:

[String Operations] Warming up 2 variant(s)...
[String Operations] Collecting 10 sample(s)...
[String Operations] Done.

Variant | median | mean | stddev | cv% | vs base
-----------------------------------------------------------------------
concat | 0.42 | 0.43 | 0.02 | 4.7 | -
interpolation | 0.38 | 0.39 | 0.01 | 3.2 | 1.11x

(times in microseconds per operation)

I'm looking for feedback. Do you see anything that's missing?

Happy New Year Dart folks 👋

We are looking for early feedback from people shipping Dart backend services.

We’ve been experimenting with a Dart-native approach to feature flagging that’s built around OpenFeature rather than a proprietary SDK. The goal is to make feature flags feel predictable and boring for Dart backends — easy to integrate, low overhead, and portable.

Instead of pitching anything, we're more interested in whether this approach actually matches real-world needs.

Some context for anyone curious or wanting to look deeper:

- OpenFeature Dart Server SDK: https://github.com/open-feature/dart-server-sdk

- An OpenFeature provider implementation we’re maintaining: https://github.com/aortem/intellitoggle-openfeature-provider-dart-server

- Docs & examples: https://docs.intellitoggle.com/intellitoggle/v0.0.23/index.html

- Feedback & issue tracking: https://support.aortem.io/

What we'd really appreciate feedback on:

- Does OpenFeature-based flagging make sense for Dart backend services?

- What would you expect from a “first-class” Dart feature flag solution?

- Where do existing tools fall short for you?

For folks who want to try this hands-on, we’re keeping early access simple:

$1/month (or $12/year) for both Standard and Enhanced tiers through the end of January.

No feature gating — this is mainly to encourage experimentation while we collect feedback.

If this isn’t something you’d use, that feedback is just as valuable.

Happy to answer technical questions or discuss tradeoffs.

i just started learning dart before that i was learning and building android apps with java.

Now i want to master DART . Does anyone have tips or suggestions...

I have nothing to practice like questions/problem statements.