Spawning isolates in Dart

Spawning new isolates in Dart is easy if you know how to do it:


import 'dart:isolate';
import 'dart:async';

void main() {
  Future isolate1 = Isolate.spawnUri(Uri.parse('isolate.dart'), [], null);
  Future isolate2 = Isolate.spawnUri(Uri.parse('isolate.dart'), [], null);

Future.wait only waits until the two isolates are spawned. If the main application stops running, the two spawned isolates will stop running as well. That’s why we need a while(true)-loop here.

The isolate itself looks like this:

library isolate;

void main() {

The two arguments after the URI are used for a list of arguments and an optional message. If you want to use this, just modify the main method of your isolate:

void main(args) {...}
void main(args, message) {...}

[Dart+Polymer] Styling Elements

Styling custom elements is sometimes tricky. In general the website styles do NOT apply to the custom element. There is a special attribute called “apply-author-styles” that can be set to “true” to apply your website’s styles to your custom element.

In general each custom element should have its ┬ástyles separated from the website so it can be reused easily. Let’s have a look at a simple example:

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