JavaScript and Node.js Fundamentals
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Questions and Answers

What is the primary function of the call stack in JavaScript?

  • To store variable values
  • To manage the execution of function calls (correct)
  • To handle event listeners
  • To handle asynchronous operations

    • What is the purpose of the 'module.exports' object in Node.js?

  • To handle HTTP requests
  • To interact with the file system
  • To export functions and objects from a module (correct)
  • To manage the event loop

    • What is the main advantage of using Promises over callbacks in JavaScript?

  • They handle errors better
  • They simplify the code structure (correct)
  • They are faster
  • They can be used in synchronous operations

    • What is the main purpose of using Postman in a web development workflow?

    <p>To test and simulate API requests</p> Signup and view all the answers

    What is the purpose of using middleware in Express.js?

    <p>To add functionality to the request-response cycle</p> Signup and view all the answers

    What is the key difference between GET and POST requests in HTTP?

    <p>GET requests can be cached, POST requests cannot</p> Signup and view all the answers

    What does the 'await' keyword do in an asynchronous function in JavaScript?

    <p>It pauses the execution of the function until a Promise is resolved</p> Signup and view all the answers

    What format is used to represent documents in MongoDB?

    <p>BSON</p> Signup and view all the answers

    What is the purpose of using 'axios' in a web application?

    <p>To make HTTP requests</p> Signup and view all the answers

    What is the main purpose of using middleware in an Express.js application?

    <p>Parsing JSON request bodies</p> Signup and view all the answers

    Study Notes

    JavaScript Fundamentals

    • The primary function of the call stack in JavaScript is to manage the execution of function calls.

    HTTP and APIs

    • HTTP status code 200 indicates a successful request.
    • The fetch API is used to send data in a POST request.
    • Promises are preferred over callbacks in JavaScript because they simplify the code structure.

    Node.js and Express.js

    • The module.exports object is used to export functions and objects from a module in Node.js.
    • In Express.js, the app.get() method is used to define a route that handles a GET request.
    • Middleware in Express.js is used to add functionality to the request-response cycle.
    • The express.static() method is used to serve static files in Express.js.

    Database and Storage

    • MongoDB is a NoSQL database that uses BSON format to represent documents.
    • The insertOne() method is used to insert a document into a collection in MongoDB.
    • Mongoose is used in Node.js applications to provide schema-based solutions for MongoDB.

    API Testing and Security

    • Postman (Hoppscotch) is a tool used to test APIs by sending HTTP requests and viewing responses.
    • Axios is used in web applications to make HTTP requests.
    • The bcrypt library is used in authentication to hash passwords securely.

    Asynchronous Programming

    • The await keyword in an asynchronous function in JavaScript pauses the execution of the function until a Promise is resolved.
    • The fakeRequest function is used to simulate network requests for practice in the context of learning callbacks and Promises.

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    Test your knowledge of JavaScript and Node.js basics, including the call stack, HTTP status codes, and module exports.

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