Identifiers

Serverless Stack

Use an identifier as a named token to specify a variable, type, field, method, or function.

Identifiers are the names you give to elements in your code. They must follow specific naming rules and provide meaningful names that clearly describe their purpose.

ID: [_a-zA-Z] [_a-zA-Z-0-9]*;
		

• Must start with a letter (a-z, A-Z) or underscore (_)
• Can contain letters, numbers (0-9), and underscores
• Case sensitive (myVar and MyVar are different)
• Cannot be a keyword

• Variations of identifiers

  a
  Z
  id
  list
  list0
  MAP25
  _map25
  Map_25
  		

  1. int a = 10;
  2. String Z = "Z";
  3. String id = "user_123";
  4. boolean list = true;
  5. float list0 = 3.14f;
  6. long MAP25 = 123456789L;
  7. double _map25 = 99.99;
  8. byte Map_25 = 25;

Choose meaningful identifier names that clearly describe their purpose:

// Good: descriptive and clear
String customerEmail = "user@example.com";
int totalPrice = calculateTotal();
boolean isProductAvailable = checkInventory();

// Avoid: unclear or too short
String s = "user@example.com";
int x = calculateTotal();
boolean b = checkInventory();