The basic things, which will help one, moving ahead in the Dart language are as below.
Its class based.
Every class has got a constructor. If one is not written, its been added by the language itself.
Constructor is not inherited.
Multiple constructors are possible.

Private properties are written with an underscore.

int _age=20;

The getter and setter are just methods with “get” and “set” added before it.

int get userAge{}

Inside a string the if something is written between “${” and “}” that value will be evaluated and appended to the string.

 'Person is of age ${j.userAge}'

Hope that helps to get you started in the language.