Google Dart gains sound null safety

Google’s Dart language is being fitted with sound null safety , helping developers avoid a class of bugs that can be hard to spot. “Sound” null safety means that Dart is 100% sure that non-nullable variables cannot be null. 
Now in preview, Dart’s null safety also improves performance, members of the Dart team said on June 10. The new feature is largest addition to the language since the introduction of Dart 2 , launched in August 2018 . Null safety is available for tryout in a version of DartPad , and due in a production-ready Dart release by the end of 2020. 
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