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Showing posts from February, 2017

Dart 1.22: Faster tools, assert messages, covariant overrides

Dart 1.22 is now available. It introduces a sync/async union type, assert messages, covariant parameter overrides, and much more. Tool startup is now much faster. Get it now! Faster tool startup We have switched to using application snapshots for running our SDK tools like dart2js, analyzer, and pub. This improves startup performance. See the AOT compiling talk  at Dart Dev Summit 2016 for more information. Information about how to use application snapshots can be found in the SDK wiki . Here are the improved performance numbers we see with the switch. Assert messages The fail-fast  principle is crucial for building high-quality software, and assert  is the simplest way to fail fast. But until now, it wasn’t possible to attach messages to asserts, so if you wanted to make your error useful, you were forced to throw a full exception. Like this: num measureDistance(List waypoints) { if (waypoints.any((point) => point.isInaccessible)) { throw new ArgumentError('At l
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