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Question-1. What is Ballerina?
Answer-1: An open-source, cloud-native programming language optimized for integration.
Question-2. Who developed Ballerina?
Answer-2: Developed by WSO2.
Question-3. What is Ballerina mainly used for?
Answer-3: Building network services, APIs, and cloud-native applications.
Question-4. What is a unique feature of Ballerina?
Answer-4: Built-in support for network interaction and concurrency.
Question-5. How does Ballerina handle concurrency?
Answer-5: Uses an actor-based concurrency model with isolated and workers.
Question-6. What are services in Ballerina?
Answer-6: They define network-accessible endpoints in applications.
Question-7. How do you define a simple HTTP service in Ballerina?
Answer-7: Using service / on new http:Listener(8080).
Question-8. What is the default data format in Ballerina?
Answer-8: JSON is a first-class data type.
Question-9. How do you define a variable in Ballerina?
Answer-9: Using var or explicit types, e.g., string name = "Ballerina";.
Question-10. What is a record in Ballerina?
Answer-10: A structured data type similar to a JSON object.
Question-11. How do you declare an array in Ballerina?
Answer-11: Using T[], e.g., int[] numbers = [1, 2, 3];.
Question-12. What is transactional in Ballerina?
Answer-12: A keyword for managing database or network transactions.
Question-13. How do you define a function in Ballerina?
Answer-13: Using function, e.g., function add(int a, int b) returns int { return a + b; }.
Question-14. What is a worker in Ballerina?
Answer-14: A lightweight thread for concurrent execution.
Question-15. What is a future in Ballerina?
Answer-15: A placeholder for an asynchronous result.
Question-16. How do you handle errors in Ballerina?
Answer-16: Using trap, check, and panic.
Question-17. How do you define a custom error type?
Answer-17: Using error type, e.g., error MyError = error("Something went wrong");.
Question-18. What is a stream in Ballerina?
Answer-18: A lazy sequence of values used for event processing.
Question-19. What is table in Ballerina?
Answer-19: A structured collection of data with constraints.
Question-20. How do you perform JSON serialization?
Answer-20: Using json j = check io:readJson("data.json");.
Question-21. How does Ballerina support REST APIs?
Answer-21: With built-in HTTP module and resource function.
Question-22. What is a client in Ballerina?
Answer-22: A construct for calling external services.
Question-23. How do you consume a REST API in Ballerina?
Answer-23: Using http:Client, e.g., http:Client client = new ("https://api.example.com");.
Question-24. What is match used for in Ballerina?
Answer-24: Pattern matching on values.
Question-25. How do you handle XML data in Ballerina?
Answer-25: Using xml type, e.g., xml x = xml \
Question-26. What are isolated functions?
Answer-26: Functions that do not share mutable state.
Question-27. What is readonly in Ballerina?
Answer-27: A qualifier to enforce immutability.
Question-28. How does Ballerina support gRPC?
Answer-28: Through the grpc module, supporting both client and server.
Question-29. How do you define a WebSocket service?
Answer-29: Using service /ws on new websocket:Listener(8080).
Question-30. How do you perform database operations in Ballerina?
Answer-30: Using sql:Client for querying databases.
Question-31. How does Ballerina handle cloud deployments?
Answer-31: Supports Kubernetes, Docker, and Ballerina Central.
Question-32. What is Ballerina Central?
Answer-32: A package repository for sharing Ballerina modules.
Question-33. How do you create a module in Ballerina?
Answer-33: Using ballerina new mymodule.
Question-34. How do you import a module in Ballerina?
Answer-34: Using import, e.g., import ballerina/http;.
Question-35. What is distinct in Ballerina?
Answer-35: Used to create unique object types.
Question-36. How does Ballerina support security?
Answer-36: With built-in JWT, OAuth2, and mutual SSL authentication.
Question-37. How do you create a RESTful API in Ballerina?
Answer-37: Using resource function get post() returns json {}.
Question-38. What is ballerina run?
Answer-38: The command to execute a Ballerina program.
Question-39. What is ballerina build?
Answer-39: The command to compile a Ballerina project.
Question-40. What is a readonly & distinct type?
Answer-40: A type with immutability and uniqueness.
Question-41. How do you call an external function in Ballerina?
Answer-41: Using external keyword.
Question-42. What is fork in Ballerina?
Answer-42: Used for parallel execution of multiple workers.
Question-43. What is listener in Ballerina?
Answer-43: A construct that waits for and handles incoming requests.
Question-44. How do you define a service that listens to Kafka?
Answer-44: Using kafka:Listener.
Question-45. How do you handle time in Ballerina?
Answer-45: Using time:Clock for date-time operations.
Question-46. What is log:printInfo used for?
Answer-46: Logging informational messages.
Question-47. How do you create a GraphQL service in Ballerina?
Answer-47: Using graphql:Service.
Question-48. What is the advantage of Ballerina over Java for integration?
Answer-48: Built-in networking, JSON support, and concurrency features.
Question-49. How do you test a Ballerina application?
Answer-49: Using ballerina test.
Question-50. What platforms does Ballerina support?
Answer-50: Supports Windows, macOS, and Linux.
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