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Published 5 years ago • verified publishertech42solutions.comDart 3 incompatible• Latest: 6.1.0+1
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An implementation of the Optional type, which helps avoid dealing with null references

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Changelog #

4.0.1 #

  • Fixed dartdoc generation

4.0.0 #

  • Added toOptional extension method
  • Note that this requires the minimum SDK version to be 2.6.0, please continue to use version 3.1.0 if upgrading to SDK version 2.6.0 is not an option.

3.1.0 #

  • Added contains(val) method.
  • Added toSet() method.
  • Added toList() method.

3.0.2 #

  • Fix Present cast() issue

3.0.1 #

  • Absent cast() method bug-fix

3.0.0 #

  • (Breaking change) Removed operator overloads. They were breaking strong-mode type checks.
  • (Breaking change) Made equality checks more consistent with Dart standards. Now any two empty Optionals are equal, and two non-empty Optionals are equal if their values are equal, regardless of their types.
  • Added a cast() method, similar to List.cast().

2.0.2 #

  • Better use of generic methods (no more dynamic).

2.0.0 #

  • Compatibility with Dart 2

1.2.3 #

  • Add an optional orElse parameter to ifPresent.

1.2.2 #

  • Optional.empty() constructor is now const.

1.2.1 #

  • Absent and Present are now subclasses of Optional. You should continue to use constructors in Optional, and not the Absent or Present ones.
  • EMPTY is now a top-level constant.

1.2.0 #

  • Operators are now overloaded, so you can add, subtract, etc., Optionals. Any operation involving an empty Optional will return an empty Optional.
  • Added examples.

1.1.0 #

  • Optional.ofNullable() and Optional.empty() constructors are now const.
  • Optional.of() constructor now throws ArgumentError when passed null, instead of NoValuePresentError.
  • NoValuePresentError now extends StateError.

1.0.0 #

  • Initial release

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An implementation of the Optional type, which helps avoid dealing with null references

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