LinkedIn Node JS Assessment Answers

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LinkedIn Node JS Assessment Answers
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LinkedIn Node JS Assessment  Questions and Answers

Q1. When a JavaScript function is invoked (called) in Node, where is a new frame placed?
  •  the call stack
  •  the event loop
  •  the poll phase
  •  the events queue
Q2. Which of the following is a core module in Node?
  •  webpack
  •  crypto
  •  request
  •  chalk
Q3. Which of the following Buffer class methods returns an uninitialized buffer?
  •  allocUnsafe
  •  contact
  •  from
  •  alloc
Q4. Which of the following modules is NOT a built-in module in Node?
 
  •  ftp
  •  events
  •  dgram
  •  http2
Q5. Which fs module method can be used to read the content of a file without buffering it in memory?
 
  •  read
  •  readFile
  •  createReadStream
  •  readFileSync
Explanation:
From official docs: https://nodejs.org/api/fs.html#fs_dir_read To minimize memory costs, when possible prefer streaming via fs.createReadStream().
Q6. Which of the following DNS module methods uses the underlying OS facilities and does not necessarily perform any network communication?
  •  lookup
  •  resolve
  •  resolve4
  •  reverse
Q7. How do you check that a value is a date object in Node?
  •  util.types.isDate(value)
  •  assert.isDate(value)
  •  console.isDate(value)
  •  util.date(value)
Q8. Can you create an HTTP web server with Node.js?
  •  no, no modules are supporting it yet
  •  yes, with the HTTPS or http2 modules
  •  yes, through the path module
  •  yes, with the HTTP module
Q9. What is the API that is designed to insulate Addons from changes in the underlying JavaScript engine?
  •  A-API
  •  Z-API
  •  N-API
  •  X-API
Q10. Which CLI option can you use to debug a node script in Chrome DevTools?
  •  –dev-tools
  •  –inspect
  •  –chrome
  •  –debug
Q11. How can you count the number of logical CPUs on the machine that is running Node?
  •  node -p “process.cpus”
  •  node -p “util.cpus().size”
  •  node -p “process.os.cpus”
  •  node -p “os.cpus().length”
Q12. Which of the following is a method on the console object?
  •  exit
  •  test
  •  time
  •  print
Q13. Which object is used to manage the cache of required modules?
  •  global.cache
  •  module.cache
  •  process.cache
  •  require.cache
Q14. What is the command to silence all process warnings?
  •  node index.js –trace-warnings
  •  node –no-warnings
  •  node -trace-warnings
  •  node index.js –no-warnings
Q15. How can you use the promise API with a callback-based function like child_process.exec?
 
  •  new Promise(child_process.exec())
  •  util.promisify(child_process.exec())
  •  util.promisify(child_process.exec)
  •  new Promise(child_process.exec)
Q16. Which of the following is NOT a Node repo command?
 
  •  .brake
  •  .history
  •  .editor
  •  .save
Q17. Which statement is true when you run the code shown below?
require(‘child_process’).fork(‘script.js’);
  •  The forked process shares the event loop with the parent process
  •  A new VM instance is created and the two VM instances will be shared between the forked process and the parent process.
  •  The forked process will have its own VM instance.
  •  The forked process shares the same VM thread with the parent process.
Q18. If EventEmitter is in scope, which of the following lines of code will have an event emitter emitting a change event?
  •  EventEmitter.emit(‘change’);
  •  EventEmitter.new().emit(‘change’);
  •  (new EventEmitter()).emit(‘change’);
  •  new EventEmitter(‘change’);
Explanation:
Because the EventEmitter is already in scope. No need to create a new one.
Q19. Which of the following objects is a stream
  •  process.uptime
  •  process.stdout
  •  process
  •  Buffer
Explanation:
process. stdout is Buffer type.
Q20. Which module variable holds the resolved absolute path of the current module file?
  •  __pathname
  •  __location
  •  __flder
  •  __filename
21. If the child_process module methods are in scope, what is a current way to execute the command ps -ef using a child process?
  •  spawn(“ps -ef”)
  •  exec(“ps -ef”)
  •  exec(“ps”, “-ef”)
  •  fork(“ps -ef”)
Q22.Which console method can be used to print the stack trace to the point of its execution?
  •  stack
  •  trace
  •  debug
  •  print
Q23.When you run JavaScript in a Node.js application, which of the following elements in a Node.js stack actually executes that JavaScript?
  •  the libuv library
  •  the c-ares library
  •  the VM (like VS or Chakra)
  •  the reply module
Q24. Looking at the code below, what does the console show?
const http = require(‘http’);
 const hostname = ‘127.0.0.1’; const port = 3000;
 const server = http.createServer((req, res) => {
  res.statusCode = 200;  res.setHeader(“Content-Type”, “text/plain”);  res.end(“Hello World\n”);
});
server.listen(port, hostname, () => { console.log(`server running at http://${hostname}:${port}/`); });
  •  server running at http://localhost:3000/
  •  server running at port 3000
  •  server running at http://localhost:4000/
  •  server running at http://127.0.0.1:3000/
Q25.What is the purpose of the path module?
  •  to provide utilities to play with file and directory paths
  •  to provide utilities to add and remove files
  •  It is a retiring module.
  •  to provide utilities to test files
Q26.How do you make an HTTP server object active and listen to requests on certain ports?
  •  server. start server. activate server. listen to the server. run
Q27.What does the code show below do?
const fs = require(‘fs’); const os = require(‘os’);
const system = os.platform(); const user = os.userInfo().username;
fs.appendFile(‘hello.txt’, `Hello ${user} on ${system}`, (err) => { if (err) throw err; console.log(‘The data was appended to file!’);}
);
  •  creates a text file hello.txt and appends customized text
  •  creates an image file
  •  console logs system information
  •  creates a file named data and append numbers
Q28.How do you start a Node application, if the entry file is indexed?
  •  nodemon start
  •  start index.js
  •  node index.js
  •  node start
Q29.What is the purpose of the file system (fs) module?
  •  to provide methods to work with requests and responses
  •  to provide methods to work with files
  •  to provide methods to work with databases
  •  to find new file systems
Q30.What is the Node LTS version?
  •  It is the current unstable version and is to be avoided.
  •  It is the version that will be retired soon.
  •  It is the version with the latest features.
  •  It is the safest version for long-term support.
Q31. Which of the following is NOT a valid stream in Node?
  •  process. stdinfo
  •  process. stdin
  •  process. stdout
  •  process. stderr
Q32. You have a script.js file with the single line of code shown here. What will be the output of executing script.js with the node command?
console.log(arguments);
  •  ReferenceError: arguments are not defined
  •  an empty string
  •  undefined
  •  an object representing an array that has five elements
Q33. Which choice is not a valid method for event emitters?
  •  start
  •  on
  •  once
  •  off
Q34. Which special object is an instance of EventEmitter?Which special object is an instance of null?
  •  process
  •  Buffer
  •  root
  •  require
Q35. What is the command to get a list of available commands for Node.js?What is the command to get a list of available commands for Node.js?
  •  node index.js -x
  •  node -v
  •  node -h
  •  node index.js -h
Q36. When a request event is received in the HTTP module, what is the type of the first argument passed to that event, usually named req?
  •  http.IncomingMessage
  •  http.ServerRequest
  •  http.ClientRequest
  •  http.ServerResponse
Q37. What are the arguments passed to the module wrapper function?
  •  exports, __filename, __dirname
  •  exports, process, require, module, __filename, __dirname
  •  exports, module, __filename, __dirname
  •  exports, require, module, __filename, __dirname
Q38. Which library provides Node.js with the event loop?
  •  V8
  •  c-ares
  •  libuv
  •  events
Q39. What does the .node file extension represent?
  •  a C++ file that can have a .node extension and that Node will be able to execute directly.
  •  a C++ Addon file that is built with node-gyp
  •  a JSON file that can have a .node extension as well as the .json extension
  •  a JavaScript file that can have a .node extension as well as the .js extension
Q40. What can you export with the module? exports?
  •  only objects.
  •  only functions
  •  only variables and arrays
  •  functions, objects, arrays, or anything you assign to the module
Q41. Which core module in Node can you use to take advantage of multicore systems?
  •  os
  •  util
  •  cluster
  •  net
Q42. Which core Node module has wrappers for OpenSSL methods?
  •  SSL
  •  hash
  •  crypto
  •  TOOLS
Q43. Which line imports a promise-based version of the readFile method?
  •  const { readFile } = require(fs).promises
  •  const { readFile } = require(fs)
  •  const { readFilePromises: readFile } = require(fs)
  •  const { readFile } = require(promises)
Q44. According to the rules of semantic versioning, what does a release incrementing the third number in an npm version string communicate to users about the release changes?
  •  Changes are not backward compatible.
  •  Changes might not be backward compatible and might break existing code.
  •  Changes are just bug fixes and no new features were added.
  •  Changes will add new functionality but will not break any existing code.
Q45. What does REPL stand for?
 
  •  run, examine, put, loop
  •  read, eval, print, loop
  •  run, edit, print, loop
  •  read, extend, print, loop
Q46. Which file does node-gyp use to read the build configuration of a module?
 
  •  .gyprc
  •  binding.gyp
  •  gyp.json
  •  package.gyp

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