Nessi Chan

1605173220

Getting started with Dart Null Safety : A beginners guide

Dart Null Safety: The first announcement of the Dart null safety as a tech preview was first made early in June this year, another followed it in the later parts of October.

In this article, we will be exploring the Dart language features and all there is to Null Safety in Dart, which the underlying language for the flutter framework, and also go over how to use it.

Dart Null Safety

Null safety is a relatively modern productivity feature that helps us avoid cases of null exceptions in our applications, These exceptions are a set of bugs that are particularly not easily debugged.

Null safety is a great milestone for the language and it also enables performance improvements and it was introduced in Dart v2.9 as a Language feature.

In dart v2.9 all types are non-nullable by default and values that can be nullable have to be specified.

#Flutter #Dart Null Safety

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Getting started with Dart Null Safety : A beginners guide

Nessi Chan

1605173220

Getting started with Dart Null Safety : A beginners guide

Dart Null Safety: The first announcement of the Dart null safety as a tech preview was first made early in June this year, another followed it in the later parts of October.

In this article, we will be exploring the Dart language features and all there is to Null Safety in Dart, which the underlying language for the flutter framework, and also go over how to use it.

Dart Null Safety

Null safety is a relatively modern productivity feature that helps us avoid cases of null exceptions in our applications, These exceptions are a set of bugs that are particularly not easily debugged.

Null safety is a great milestone for the language and it also enables performance improvements and it was introduced in Dart v2.9 as a Language feature.

In dart v2.9 all types are non-nullable by default and values that can be nullable have to be specified.

#Flutter #Dart Null Safety

Mike  Kozey

Mike Kozey

1622433101

Null Safety Support For Flutter & Dart

Dart serves an extraordinary part in Flutter, fueling developer highlights, for example, hot reload, and empowering multi-stage applications for mobile, desktop, and web utilizing Dart’s adaptable compiler innovation. We endeavor to make the Dart language the most useful for Flutter application developers; for instance, we added UI-as-code language builds to upgrade the Dart linguistic structure for coding Flutter widget trees.

In July 2020, sound null wellbeing was acquainted with the Dart programming language. As this language powers Flutter SDK, the help for null safety was one of the expected enhancements accompanying Flutter 2. We’re reporting a subsequent tech review of sound null safety, including support for the Flutter structure.

The arrival of the new Flutter on March 3, 2021, at last, made it conceivable not exclusively to compose new code utilizing the null safety include yet additionally to move the current Flutter applications to null safety. Null safety is a significant new efficiency highlight that assists you with staying away from null exemptions, a class of bugs that are regularly difficult to spot.

In this blog, we will explore the Null Safety Support for Flutter & Dart.We will take a look at how null safety is implemented in Flutter, how it influences the development process, what benefits it brings, and migrating to null safety in your flutter applications.

Table Of Contents ::

What is Sound null safety?

Why null safety?

What are Null safety design principles?

Unsound null safety

Making a null safety easier to use

Preferring to null safety

Migrating to null safety

Reasons to migrate a Flutter app to null safety

Conclusion

#dart #null-safety #flutter

Waldo  Rippin

Waldo Rippin

1625777580

Dart Null-safety and How It Affects Flutter

Randal talks about Dart “Non-Null-By-Default”-safety: what it is, how it affects using Dart, and how to migrate to it (properly!), and the Flutter releases that revealed and enhanced NNBD Dart (Flutter 2.0 and 2.2), at Flutter Engage and Google I/O 2021.

#flutter #dart null #dart

Brain  Crist

Brain Crist

1603659600

Dart sound null safety: technical preview 2

Dart serves a special role in Flutter, powering developer features such as hot reload, and enabling multi-platform apps for mobile, desktop, and web via Dart’s flexible compiler technology. We strive to make the Dart language the most productive for Flutter app developers; for example, we added UI-as-code language constructs to optimize the Dart syntax for coding Flutter widget trees.

In June we offered a first tech preview of null safety for Dart. Today is another major milestone, which we’ve looked forward to for a while: We’re announcing a second tech preview of sound null safety, including support for the Flutter framework.

Null safety is a major new productivity feature that helps you avoid null exceptions, a class of bugs that are often hard to spot. As an added bonus, this feature also enables a range of performance improvements. We’re really looking forward to your feedback.

Why null safety?

Dart is a type-safe language. This means that when you get a variable of some type, the compiler can guarantee that it is of that type. But type safety by itself doesn’t guarantee that the variable is not null.

Null errors are very common. A search on GitHub leads to thousands of issues caused by unexpected nulls in Dart code, and even more thousands of commits trying to fix those issues. Try to see if you can spot the nullability problems in the following Flutter app, imagining that Config and WeatherService are backend services used by the app:

This app will certainly fail if getAppName() returns a null; in that case we’ll pass a null to the Text widget used in the title of AppBar.

But there are more subtle cases to consider: getTemperatures() could also return null. In that case the for-loop will fail. Or getTemperatures() could return a list as expected, but that list might contain null values, in which case we’ll call round() on null, and the app will fail.

The null safety feature makes these problems go away by validating your code as you’re typing:

Screenshot of the preceding code with null errors.

With null safety, Dart finds potential null errors in your code.

With null safety, you can reason about your code with more confidence. No more pesky runtime null dereferencing errors in deployed apps. Instead, you get static errors as you code.

#programming #dart #null-safety #announcements #flutter

Waldo  Rippin

Waldo Rippin

1625773920

Null Safety and Subclasses in Dart - The Devious Coin Trick

Randal demonstrates why the analyzer can’t guarantee that once a null check has been processed, the value is definitely not null for further steps.

#null safety #dart #devious coin trick