Dart Syntax: Identifiers

Identifiers can include letters (both uppercase and lowercase), digits, and underscores.

They must start with a letter (a-z or A-Z), an underscore (_), or a dollar sign ($).

Dart is case-sensitive, so myVariable and MyVariable are considered different identifiers.

Identifiers cannot be reserved words or keywords used by Dart.

Camel Case Convention:

• Dart conventionally uses camel case for identifiers. In camel case, the first word starts with a lowercase letter, and the subsequent words are capitalized. This is commonly used for variables and functions.

    dartCopy codevar myVariable;
    void calculateTotalAmount() {
      // code
    }
  

Pascal Case Convention:

• For class names, Dart often follows the Pascal case convention. In Pascal case, the first letter of each word is capitalized.

    dartCopy codeclass Person {
      // class definition
    }
  

Underscores:

• Dart allows identifiers to start with an underscore. This is often used to indicate that the identifier is private to its library.

    dartCopy codevar _secretVariable;
  

Dollar Sign:

• Dart allows the use of the dollar sign in identifiers. This is often used in string interpolation and can be part of variable names.

    dartCopy codevar $price = 10;
    print($price); // 10
  

Reserved Words:

• Certain words are reserved by Dart and cannot be used as identifiers. For example, int, double, if, else, and so on.

    dartCopy code// This is not allowed
    var int = 5;