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Sourced from meta's changelog.

1.12.0 - 2015-08-31

Language changes

• Null-aware operators
  • ??: if null operator. expr1 ?? expr2 evaluates to expr1 if not null, otherwise expr2.
  • ??=: null-aware assignment. v ??= expr causes v to be assigned expr only if v is null.
  • x?.p: null-aware access. x?.p evaluates to x.p if x is not null, otherwise evaluates to null.
  • x?.m(): null-aware method invocation. x?.m() invokes m only if x is not null.

Core library changes

• dart:async

  • StreamController added setters for the onListen, onPause, onResume and onCancel callbacks.

• dart:convert

  • LineSplitter added a split static method returning an Iterable.

• dart:core

  • Uri class now perform path normalization when a URI is created. This removes most .. and . sequences from the URI path. Purely relative paths (no scheme or authority) are allowed to retain some leading "dot" segments. Also added hasAbsolutePath, hasEmptyPath, and hasScheme properties.

• dart:developer

  • New log function to transmit logging events to Observatory.

• dart:html

  • NodeTreeSanitizer added the const trusted field. It can be used instead of defining a NullTreeSanitizer class when calling setInnerHtml or other methods that create DOM from text. It is also more efficient, skipping the creation of a DocumentFragment.

• dart:io

  • Added two new file modes, WRITE_ONLY and WRITE_ONLY_APPEND for opening a file write only. eaeecf2
  • Change stdout/stderr to binary mode on Windows. 4205b29

... (truncated)

• b4fa68e Band-aid fix for issue #24191.
• 00d6b50 Add library prefixes to NO_LOCATION_SPANNABLE and MessageKind.
• daff4e7 [dart2js] fix inference of ??= and []??=
• 40c76bb dart2js: fail gracefully with invalid package config
• 1aecb65 dart2js: remove trailing 0 byte when reading .packages
• 7f78948 dart2js: don't add a trailing slash when reading --packages
• 99c2010 Handle comparison of empty URIs (sdk/24126).
• 971f0a2 comment docgen test
• 3e970df comment out failing docgen test
• c7e7953 update dartdoc, markdown in DEPS
• Additional commits viewable in compare view

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