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Question-1. What is Deno?
Answer-1: A secure JavaScript and TypeScript runtime built on V8 and Rust.
Question-2. Who created Deno?
Answer-2: Ryan Dahl, the creator of Node.js.
Question-3. Why was Deno created?
Answer-3: To improve security, module management, and developer experience over Node.js.
Question-4. What programming language is used to build Deno?
Answer-4: Rust.
Question-5. What scripting languages does Deno support?
Answer-5: JavaScript and TypeScript.
Question-6. How do you install Deno?
Answer-6: Using brew install deno (macOS), choco install deno (Windows), or `curl -fsSL https://deno.land/install.sh
Question-7. How do you run a Deno script?
Answer-7: deno run script.ts.
Question-8. What makes Deno more secure than Node.js?
Answer-8: Deno has no default access to the file system, network, or environment variables.
Question-9. How do you allow file system access in Deno?
Answer-9: Using the --allow-read or --allow-write flags.
Question-10. How do you allow network access in Deno?
Answer-10: Using the --allow-net flag.
Question-11. How do you allow all permissions in Deno?
Answer-11: Using --allow-all.
Question-12. What is the built-in formatter in Deno?
Answer-12: deno fmt.
Question-13. How do you check for errors in a Deno script?
Answer-13: Using deno lint.
Question-14. Does Deno support npm packages?
Answer-14: No, Deno uses URL-based module imports.
Question-15. How do you import a module in Deno?
Answer-15: Using direct URLs, e.g., import { serve } from "https://deno.land/std/http/server.ts";.
Question-16. What is deno.land/x?
Answer-16: A module registry for Deno-hosted third-party packages.
Question-17. What is the standard library in Deno?
Answer-17: A collection of utilities available at https://deno.land/std.
Question-18. What flag enables TypeScript execution in Deno?
Answer-18: No flag is needed; TypeScript runs natively.
Question-19. How do you bundle a Deno project?
Answer-19: Using deno bundle source.ts output.js.
Question-20. What is deno doc used for?
Answer-20: Generating documentation from TypeScript/JSDoc comments.
Question-21. How do you create an HTTP server in Deno?
Answer-21: Using Deno.serve() or import { serve } from "https://deno.land/std/http/server.ts";.
Question-22. How do you fetch data in Deno?
Answer-22: Using await fetch("https://api.example.com");.
Question-23. How do you execute a shell command in Deno?
Answer-23: Using Deno.run({ cmd: ["ls"] }).
Question-24. What is the Deno global object?
Answer-24: It provides runtime APIs, replacing process in Node.js.
Question-25. How do you read a file in Deno?
Answer-25: Using await Deno.readTextFile("file.txt");.
Question-26. How do you write a file in Deno?
Answer-26: Using await Deno.writeTextFile("file.txt", "Hello Deno");.
Question-27. How do you create a directory in Deno?
Answer-27: Using await Deno.mkdir("new-folder");.
Question-28. How do you remove a file in Deno?
Answer-28: Using await Deno.remove("file.txt");.
Question-29. What is deno cache used for?
Answer-29: Caching remote dependencies locally.
Question-30. What is deno install used for?
Answer-30: Installing scripts as executables.
Question-31. What does deno test do?
Answer-31: Runs test scripts in Deno.
Question-32. How do you define a test in Deno?
Answer-32: Using Deno.test("example test", () => { assertEquals(1 + 1, 2); });.
Question-33. What is --inspect used for in Deno?
Answer-33: Enables debugging with Chrome DevTools.
Question-34. How do you watch files for changes in Deno?
Answer-34: Using deno run --watch script.ts.
Question-35. How do you generate a lockfile in Deno?
Answer-35: Using --lock=lock.json.
Question-36. Can Deno execute CommonJS modules?
Answer-36: No, it only supports ES modules.
Question-37. How do you handle environment variables in Deno?
Answer-37: Using Deno.env.get("VAR_NAME"); (requires --allow-env).
Question-38. What is deno repl?
Answer-38: An interactive Deno shell for testing commands.
Question-39. How do you benchmark performance in Deno?
Answer-39: Using Deno.bench().
Question-40. How do you check the Deno version?
Answer-40: Using deno --version.
Question-41. How do you get system information in Deno?
Answer-41: Using Deno.build and Deno.osRelease().
Question-42. What is Deno.resources()?
Answer-42: It lists open resource handles in the runtime.
Question-43. What is Deno.core?
Answer-43: An internal API for low-level interactions (not recommended for general use).
Question-44. How do you run a Deno script without permission prompts?
Answer-44: Using --no-prompt.
Question-45. How do you enable unstable features in Deno?
Answer-45: Using --unstable.
Question-46. What is the Deno.crypto module?
Answer-46: Provides cryptographic utilities like hashing and random number generation.
Question-47. What is Deno.permissions used for?
Answer-47: Checking and requesting runtime permissions.
Question-48. What is the difference between Deno and Node.js?
Answer-48: Deno is secure by default, supports TypeScript natively, and doesn't use npm.
Question-49. How do you create a WebSocket server in Deno?
Answer-49: Using Deno.serve() with the upgradeWebSocket method.
Question-50. How do you exit a Deno script?
Answer-50: Using Deno.exit(0);.
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