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Question-1. What is Elm programming language?
Answer-1: Elm is a functional programming language designed for building web applications, focusing on simplicity, performance, and robustness.
Question-2. Who created Elm language?
Answer-2: Evan Czaplicki created Elm in 2012.
Question-3. What is the primary purpose of Elm?
Answer-3: Elm is primarily used for building web frontend applications with clean, maintainable, and functional code.
Question-4. Is Elm a compiled language?
Answer-4: Yes, Elm is compiled to JavaScript so it can run in the browser.
Question-5. Does Elm have runtime exceptions?
Answer-5: No, Elm guarantees no runtime exceptions due to its strict type system.
Question-6. What is the Elm Architecture (TEA)?
Answer-6: The Elm Architecture (TEA) is a design pattern that consists of Model, Update, and View for building web applications.
Question-7. What is the syntax to declare a variable in Elm?
Answer-7: Example: name = "John"
Question-8. Does Elm use TypeScript or JavaScript?
Answer-8: No, Elm has its own language but it compiles to JavaScript.
Question-9. What file extension does Elm use?
Answer-9: Elm files use the extension .elm.
Question-10. What is the package manager for Elm?
Answer-10: Elm uses elm-package or elm-tooling as a package manager.
Question-11. What is the function of elm-reactor?
Answer-11: elm-reactor provides a local development server to test Elm applications.
Question-12. Can Elm interact with JavaScript code?
Answer-12: Yes, Elm can interact with JavaScript using Ports.
Question-13. What is a Port in Elm?
Answer-13: A Port is a way to communicate between Elm and JavaScript.
Question-14. How do you define a function in Elm?
Answer-14: Example: greet name = "Hello, " ++ name
Question-15. Is Elm a purely functional language?
Answer-15: Yes, Elm is a purely functional programming language.
Question-16. Can Elm applications use JavaScript libraries like React?
Answer-16: No, Elm does not use React, but it can interact with JavaScript via Ports.
Question-17. What is the Elm REPL?
Answer-17: Elm REPL (Read-Eval-Print-Loop) allows running Elm code in an interactive shell.
Question-18. How do you install Elm on your system?
Answer-18: Using Node.js: npm install -g elm or elm-install.
Question-19. What is the Elm compiler?
Answer-19: The Elm compiler converts Elm code into JavaScript for browser execution.
Question-20. Can Elm produce HTML output?
Answer-20: Yes, Elm can generate HTML via elm/browser.
Question-21. Does Elm have mutable variables?
Answer-21: No, Elm only supports immutable variables.
Question-22. Can Elm handle side effects like HTTP requests?
Answer-22: Yes, Elm handles side effects using Cmd (Command) and Sub (Subscription).
Question-23. What is a Msg in Elm architecture?
Answer-23: Msg (Message) is a way to send events or data in Elm applications.
Question-24. Can Elm work with REST APIs?
Answer-24: Yes, using elm/http you can make REST API requests.
Question-25. What is the main advantage of Elm?
Answer-25: No runtime exceptions, clean syntax, and functional programming.
Question-26. Is Elm compatible with Node.js?
Answer-26: Yes, you can run Elm using Node.js and compile it to JavaScript.
Question-27. Can Elm be used for backend development?
Answer-27: No, Elm is designed specifically for frontend web development.
Question-28. What is the syntax to create a list in Elm?
Answer-28: Example: numbers = [1, 2, 3, 4]
Question-29. What is the default port in Elm reactor?
Answer-29: Elm reactor runs on http://localhost:8000.
Question-30. Can Elm be deployed on cloud platforms?
Answer-30: Yes, Elm can be deployed on Netlify, Vercel, Heroku, etc..
Question-31. How do you install an Elm package?
Answer-31: Command: elm install
Question-32. Can you use Elm without JavaScript?
Answer-32: No, Elm compiles to JavaScript, so it requires JavaScript.
Question-33. What is a Model in Elm?
Answer-33: Model represents the application state in Elm architecture.
Question-34. What is Update in Elm architecture?
Answer-34: Update contains logic to modify the Model based on incoming messages (Msg).
Question-35. What is View in Elm architecture?
Answer-35: View is responsible for rendering the HTML output based on the Model.
Question-36. Can Elm use CSS frameworks like Tailwind or Bootstrap?
Answer-36: Yes, Elm applications can use external CSS frameworks like Bootstrap, Tailwind, etc.
Question-37. What is Elm's Virtual DOM?
Answer-37: Elm uses a Virtual DOM to efficiently update the user interface.
Question-38. What is a Command in Elm?
Answer-38: Command (Cmd) is a way to trigger side effects like HTTP requests, DOM manipulation, etc.
Question-39. What is Subscription in Elm?
Answer-39: Subscription (Sub) is a way to listen to external events like mouse clicks, time intervals, etc.
Question-40. Can Elm applications work offline?
Answer-40: Yes, Elm applications can work offline using Service Workers.
Question-41. What is elm-format?
Answer-41: elm-format is a tool to automatically format Elm code.
Question-42. Can Elm applications work with GraphQL APIs?
Answer-42: Yes, using elm-graphql package.
Question-43. Can Elm build mobile applications?
Answer-43: No, Elm is primarily used for web frontend development.
Question-44. Is Elm compatible with TypeScript?
Answer-44: No, Elm does not support TypeScript, but it can interact with JavaScript.
Question-45. Can Elm be integrated into existing projects?
Answer-45: Yes, Elm can be embedded inside existing JavaScript applications.
Question-46. What is the default package registry for Elm?
Answer-46: The Elm Package Registry (https://package.elm-lang.org).
Question-47. How do you run an Elm project?
Answer-47: Run: elm make src/Main.elm and open the generated index.html.
Question-48. Does Elm have built-in testing tools?
Answer-48: Yes, Elm has a built-in testing framework called elm-test.
Question-49. Can Elm be used for WebAssembly (Wasm)?
Answer-49: No, Elm currently compiles only to JavaScript.
Question-50. Is Elm language still actively maintained?
Answer-50: Yes, Elm 0.19.1 is the latest stable version as of now.
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