Introduction

Dart 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. Dart compilers and runtimes can optimize away internal null checks, so apps can be faster and smaller.

Syntax of null Safety is similar to that of _kotlin, C#, _operators, and keywords related to null safety include ?, !, and late .

Now in preview, Dart’s null safety also improves performance, members of the Dart team said on June 10. The new feature is the largest addition to the language since the introduction of Dart 2, launched in August 2018.

Null safety is available for a tryout in a version of DartPad, and due in a production-ready Dart release by the end of 2020.

DartPad with null safety.

Contents

Creating variables
Using variables and expressions
Understanding list,
Set types
Map types

Let’s Begin …

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