Ballerina

Ballerina, short for Ballerina Programming Language, is an open-source, cloud-native programming language designed for networked applications and microservices, created by WSO2 in 2017. Ballerina runs on the Java Virtual Machine (JVM) and provides built-in support for services, APIs, and data handling in distributed systems. It can be downloaded via the Ballerina Official Downloads, and programs are run using the ballerina run command or developed interactively with the Ballerina Visual Studio Code extension.

Ballerina exists to simplify development of networked and cloud-native applications. It addresses challenges in API composition, service orchestration, and data transformation by providing first-class abstractions for services, endpoints, and connectors. Its design philosophy emphasizes readability, concurrency safety, and declarative service integration, enabling developers to write robust microservices with minimal boilerplate.

Ballerina: Variables and Functions

Ballerina uses int, string, and other typed variables. Functions are defined with function and can return multiple values.

import ballerina/io;

int hourlyRate = 25;
int hoursWorked = 40;

function grossPay(int rate, int hours) returns int {
return rate * hours;
}

io:println("Gross Pay: ", grossPay(hourlyRate, hoursWorked));

Typed variables and explicit functions ensure correctness while allowing straightforward arithmetic and logic operations in services and computations.

Ballerina: Conditional Logic

Conditionals are expressed with if, else if, and else statements.

int age = 30;

if (age >= 18) {
io:println("Adult");
} else {
io:println("Minor");
}

These constructs enable decision-making based on variables, input, or service responses, supporting robust program flow.

Ballerina: Records and Maps

Ballerina provides records and maps as flexible data structures for representing structured data.

type Employee record {
    string name;
    int id;
    int salary;
};

Employee emp = {name: "John Doe", id: 123456, salary: 1025};

io:println("Employee Name: ", emp.name);

These structures facilitate data modeling, transformation, and serialization, essential for API communication and service orchestration.

Ballerina: Services and Endpoints

Services are defined with service and attached to endpoints to handle network requests.

import ballerina/http;

service /hello on new http:Listener(8080) {
resource function get sayHello(http:Caller caller, http:Request req) {
caller->respond("Hello, World!");
}
}

This approach integrates networking directly into the language, simplifying REST API and microservice creation.

Ballerina is used in microservices, API development, and cloud-native applications. It integrates with platforms such as Java, Kubernetes, and Docker to build, deploy, and manage distributed applications efficiently. Its first-class support for networked communication and structured data makes it a compelling choice for modern enterprise systems.