Dart has it’s own naming conventions for the Variables, Fields, Methods, Classes, and Packages.

1. Variables and Field name will starts with Lower-Case and every Second word’s first letter will be Upper-Case like firstName, secondName, getAllColors. Using Under-Score in the middle of the Variable or Field Name is discussed in Dart. But you can use the underscore at the beginning of a Variable or File Name and if you do so then it will be a Private Variable or Private Field and it’s Scope will be Local.

2. Class names will starts with Upper-Case letter and every second word’s first letter is also Upper-Case like

class People{
    }

class ProductService{
     } 

class MaterialPageRoute{
   }

If you want to make the class Private then use Under-Score in front of Class name. See Below :-

class _People{
    }

class _ProductService{
     } 

class _MaterialPageRoute{
   }

3. All the Libraries, Packages, Directories, and Source Files will be named LowerCase with UnderScores like lower_case_underscores.

Note :- Constant Names, Methods, Method Parameters will follow the Variable Naming Convention.

     const pi = 3.14 -> const_pi = 3.14
     getAllProducts(){}  -> _getAllProducts(){}
     getProductByName(String name){}