With this feature Null Pointer Exception, one of the most frequent errors is fixed . Null Safety was introduced by Dart. It minimizes bugs and improves efficiency.
It is very difficult to debug or know about the error if you don’t use safety in your file or project .
For example : In your code if you wants to get a variable value as String but the value you will get is null, in the app you will get runtime exception, for eg. String name = null;
If variable name is empty by default we will get NULL .And it causes errors difficult to find.
Assigning this feature to any variable, it will give the output null if it is assigned null during declaration. But when a value is assignes it will print assigned value So this way we can reduce bugs.
If an app package’s basic Dart SDK requirement is Dart 2.12 or above, it will operate with safety.
How to use Null Safety in Your Project
#Add SDK version in ‘pubspec.yaml’ file environment: sdk: “>=2.12.0-0 <3.0.0”
To enable safety, set the SDK constraint to a language version of 2.12.0 or after version. For example, your yaml file have the following constraints:
sdk: “>=2.12.0-0 <3.0.0”
Why use Null Safety
When we get to talk about Dart ,it is basically a type safe language. If there is a variable of any type compiler can tell that it is of that type with assurance. But type safety feature doesn’t promise that variable is not null. But using null safety ensures you to keep away from null reference errors and your code to work smoothly.
Advantages
- Using this you will get less errors in your code and a better environment for development.
- It will lead to faster execution of code.
- If you use this feature it does not throw any null reference errors so it is very easy to write code using this feature .
- This feature will reduce the amount of time by notifying you about likely null unsafe code at compile time itself.