Identifiers
Elastic Cloud Serverless projects are autoscaled environments, fully managed by Elastic and available on Elastic Cloud. Availability This functionality is generally available and ready for production usage. Serverless interfaces and procedures might differ from classic Elastic Stack deployments. The Elastic Stack includes Elastic's core products such as Elasticsearch, Kibana, Logstash, and Beats. Availability This functionality is generally available and ready for production usage. Unless stated otherwise on the page, this functionality is available when your Elastic Stack is deployed on Elastic Cloud Hosted, Elastic Cloud Enterprise, Elastic Cloud on Kubernetes, and self-managed environments. This documentation corresponds to the latest patch available for each minor version. If you're not using the latest patch, check the release notes for changes.
Serverless
Generally available
Stack
Generally available
Use an identifier as a named token to specify a variable, type, field, method, or function.
Identifiers cannot be keywords. Using a keyword as an identifier will result in a compilation error.
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 (
myVarandMyVarare different) - Cannot be a keyword
Variations of identifiers
Text a Z id list list0 MAP25 _map25 Map_25- int a = 10;
- String Z = "Z";
- String id = "user_123";
- boolean list = true;
- float list0 = 3.14f;
- long MAP25 = 123456789L;
- double _map25 = 99.99;
- 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();