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Question-1. What is WebAssembly (WASM)?
Answer-1: A binary instruction format for a stack-based virtual machine designed for high-performance execution in web browsers.
Question-2. What is the purpose of WebAssembly?
Answer-2: To run code at near-native speed in web browsers and other environments.
Question-3. What languages can compile to WebAssembly?
Answer-3: C, C++, Rust, AssemblyScript, Go, and more.
Question-4. How does WebAssembly improve web performance?
Answer-4: By providing a compact binary format that loads and executes faster than JavaScript.
Question-5. What file extension does a WebAssembly module use?
Answer-5: .wasm.
Question-6. Can WebAssembly run outside the browser?
Answer-6: Yes, it can run in environments like Node.js and Wasmtime.
Question-7. What is wat in WebAssembly?
Answer-7: WebAssembly Text Format (WAT), a human-readable representation of .wasm.
Question-8. How do you convert .wat to .wasm?
Answer-8: Using wat2wasm from the WebAssembly Binary Toolkit (WABT).
Question-9. How do you load a WebAssembly module in JavaScript?
Answer-9: Using WebAssembly.instantiateStreaming(fetch("module.wasm")).
Question-10. What are the key components of a WebAssembly module?
Answer-10: Functions, memory, tables, and global variables.
Question-11. What is wasm-bindgen?
Answer-11: A Rust tool for bridging JavaScript and WebAssembly.
Question-12. How does WebAssembly interact with JavaScript?
Answer-12: Through the WebAssembly JavaScript API using imports/exports.
Question-13. What is wasm-pack?
Answer-13: A Rust tool that simplifies building and packaging WebAssembly modules.
Question-14. What are WebAssembly imports?
Answer-14: Functions or objects from JavaScript that WebAssembly can call.
Question-15. What are WebAssembly exports?
Answer-15: Functions inside a .wasm module that JavaScript can call.
Question-16. How does WebAssembly handle memory?
Answer-16: Using linear memory (WebAssembly.Memory).
Question-17. How do you allocate memory in WebAssembly?
Answer-17: By growing the memory using memory.grow(pages).
Question-18. What is the default page size in WebAssembly memory?
Answer-18: 64KB per page.
Question-19. Can WebAssembly directly manipulate the DOM?
Answer-19: No, it needs JavaScript to interact with the DOM.
Question-20. What is WASI?
Answer-20: WebAssembly System Interface, allowing WebAssembly to interact with system resources.
Question-21. Can WebAssembly replace JavaScript?
Answer-21: No, it is designed to complement JavaScript, not replace it.
Question-22. What are the advantages of WebAssembly?
Answer-22: Speed, portability, security, and support for multiple languages.
Question-23. What are the limitations of WebAssembly?
Answer-23: Limited access to browser APIs and complex debugging.
Question-24. How does WebAssembly handle multithreading?
Answer-24: Using WebAssembly threads (when supported by the host environment).
Question-25. How do you debug WebAssembly?
Answer-25: Using browser DevTools, .wat format, and wasm2wat.
Question-26. What is emscripten?
Answer-26: A toolchain to compile C/C++ to WebAssembly.
Question-27. How do you compile a C program to WebAssembly?
Answer-27: Using emcc program.c -o program.wasm.
Question-28. What is a WebAssembly table?
Answer-28: A data structure for storing function references.
Question-29. What is the difference between WebAssembly and asm.js?
Answer-29: WebAssembly is a binary format, while asm.js is a subset of JavaScript.
Question-30. Can WebAssembly run on mobile devices?
Answer-30: Yes, in browsers that support WebAssembly.
Question-31. What security model does WebAssembly follow?
Answer-31: A sandboxed execution model similar to JavaScript.
Question-32. What are the performance benefits of WebAssembly?
Answer-32: Faster execution, lower memory footprint, and efficient compilation.
Question-33. How do you call a WebAssembly function from JavaScript?
Answer-33: Using instance.exports.functionName().
Question-34. How do you export a function in WebAssembly?
Answer-34: Using (export "funcName" (func $function)) in WAT.
Question-35. How does WebAssembly handle garbage collection?
Answer-35: It relies on the host language (e.g., JavaScript) for memory management.
Question-36. What is the wasm-opt tool?
Answer-36: A WebAssembly optimizer from the Binaryen toolkit.
Question-37. How do you check if a browser supports WebAssembly?
Answer-37: Using 'WebAssembly' in window.
Question-38. Can WebAssembly modules be shared between different applications?
Answer-38: Yes, as long as they follow the same ABI.
Question-39. What is the role of LLVM in WebAssembly?
Answer-39: It provides compiler backends for languages like C, C++, and Rust.
Question-40. How do you pass arguments to a WebAssembly function?
Answer-40: By using JavaScript instance.exports.functionName(arg1, arg2).
Question-41. Can WebAssembly access local files?
Answer-41: Not directly in the browser, but possible via WASI in standalone runtimes.
Question-42. What is the WebAssembly.Module API?
Answer-42: It compiles WebAssembly code into an executable module.
Question-43. What is the WebAssembly.Instance API?
Answer-43: It creates an instance of a compiled WebAssembly module.
Question-44. What is the WebAssembly.Memory API?
Answer-44: It provides a memory buffer for WebAssembly modules.
Question-45. What is the WebAssembly.Table API?
Answer-45: It allows WebAssembly to store function references.
Question-46. How do you load a WebAssembly module asynchronously?
Answer-46: Using WebAssembly.instantiateStreaming().
Question-47. Can WebAssembly be used for game development?
Answer-47: Yes, it enables high-performance execution of game engines like Unity and Unreal Engine.
Question-48. How do you optimize WebAssembly performance?
Answer-48: Using wasm-opt, reducing memory usage, and using efficient data structures.
Question-49. What are WebAssembly threads?
Answer-49: A proposal that enables parallel execution using Web Workers.
Question-50. What is the future of WebAssembly?
Answer-50: Expanding support beyond the web, improving language interoperability, and adding features like garbage collection.
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