How to create private variables in Dart?

Question

I want to create a private variable but I cannot.

Here is my code:

void main() {
  var b = new B();
  b.test         


        

Answer 1

From Dart documentation:

Unlike Java, Dart doesn’t have the keywords public, protected, and private. If an identifier starts with an underscore _, it’s private to its library.

Libraries not only provide APIs, but are a unit of privacy: identifiers that start with an underscore _ are visible only inside the library.

A few words about libraries:

Every Dart app is a library, even if it doesn’t use a library directive. The import and library directives can help you create a modular and shareable code base.

You may have heard of the part directive, which allows you to split a library into multiple Dart files.