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Dart language specification

Use this page to find the formal Dart language specification. For a gentler introduction to Dart, see the language tour.

Dart 3

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The Dart 3 language specification is in progress. You can find the in-progress specification in PDF format:

New language features are typically described using informal language feature specifications in the dart-lang/language repo:

Dart 2

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The Dart 2 language specification is available in PDF format:

For information on Dart versions 2.12 and later, which have support for null safety, check out the in-progress Dart 3 specification.

Dart 1.x

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The formal Dart 1.x language specification is available from the Ecma International website: