To handle uncaught exceptions in a Node.js application, you can use process.on('______', callback).

  • unhandledRejection
  • process.error
  • exception
In Node.js, you can handle uncaught exceptions by using the process.on('unhandledRejection', callback) event. This allows you to capture unhandled promise rejections and take appropriate actions.

You are building a game where a player must answer a series of questions. How would you structure the control flow to handle the player’s responses and determine the next action or question based on the response?

  • if...else if...else statements
  • switch statement
  • try...catch statements
  • while loop
To handle the player's responses and determine the next action or question based on the response in a game, you would typically use a series of if...else if...else statements. These conditional statements allow you to evaluate multiple conditions and execute corresponding code blocks based on the player's response. The switch statement can also be used, but it's better suited for cases where you need to match a single value to multiple possible cases. try...catch is used for error handling, and a while loop is generally not suitable for handling player responses in this context.

What is the role of the extends property in an ESLint configuration file?

  • It specifies the file extensions to be linted.
  • It extends the code editor with ESLint features.
  • It defines the list of plugins to use.
  • It inherits configurations from other configurations.
The extends property in an ESLint configuration file allows you to inherit configurations from other configurations. It's a way to reuse or build upon existing ESLint configurations, making it easier to enforce consistent coding standards across projects.

When an error occurs in Node.js, the error object is typically an instance of __________.

  • Error
  • Exception
  • ErrorObject
  • Err
In Node.js, when an error occurs, the error object is typically an instance of the built-in Error object. This object contains valuable information about the error, such as a message and a stack trace.

Which data type in JavaScript can be used to store a sequence of characters?

  • char
  • sequence
  • string
  • text
In JavaScript, the string data type is used to store a sequence of characters. The char data type doesn't exist in JavaScript, and neither sequence nor text are valid data types for this purpose.

How does semantic versioning handle pre-release versions and build metadata?

  • Pre-release versions are denoted with a hyphen and can include additional labels and numbers. Build metadata is indicated with a plus sign.
  • Pre-release versions use square brackets to specify additional labels, and build metadata uses parentheses.
  • Pre-release versions are marked with a plus sign, and build metadata is indicated with a hyphen.
  • Pre-release versions are not supported in semantic versioning.
Semantic versioning allows pre-release versions to be denoted with a hyphen, followed by additional labels and numbers, and build metadata is indicated with a plus sign. This is essential for managing versions during development and testing phases.

Why would you use the global object to store data in a Node.js application?

  • To share data between different Node.js modules.
  • To encapsulate data and prevent it from being accessed globally.
  • To improve application performance by reducing memory usage.
  • To ensure data persistence across application runs.
The global object in Node.js can be used to store data that needs to be shared between different Node.js modules. It acts as a global namespace for variables and allows you to share data across different parts of your application. The other options do not accurately describe the common use case for the global object.

When handling errors in an async function, if an error is not caught within the function, it will cause the returned Promise to be in a ________ state.

  • Pending
  • Fulfilled
  • Rejected
  • Completed
When an uncaught error occurs in an async function, the returned Promise will be in a "Rejected" state. In the Promise lifecycle, it can start as "Pending," move to "Fulfilled" upon success, or "Rejected" upon an error.

How does JavaScript handle circular dependencies between modules?

  • JavaScript throws an error and does not allow circular dependencies.
  • JavaScript allows circular dependencies, and they are resolved at runtime.
  • JavaScript handles circular dependencies by allowing them but ensuring that each module loads only once.
  • Circular dependencies are not supported in JavaScript.
JavaScript allows circular dependencies, but it ensures that each module is only executed once. This is achieved through a mechanism called "module caching."

Which keyword is used to export multiple things from a module in JavaScript?

  • import
  • export
  • require
  • module
In JavaScript, the export keyword is used to export multiple things from a module. It allows you to specify which functions, objects, or variables should be accessible from outside the module. The import keyword is used for importing from modules, not exporting. The require and module keywords are used in CommonJS, a different module system.

Which of the following is the primary role of middleware in Express.js?

  • Handling client-side routing
  • Handling server-side routing
  • Managing HTTP requests and responses
  • Creating database schemas
The primary role of middleware in Express.js is to manage HTTP requests and responses. Middleware functions are executed in the order they are defined in the Express application and can perform various tasks such as authentication, logging, and modifying request/response objects. They play a crucial role in the request/response cycle.

In what way does the Event Loop affect the performance of a Node.js application?

  • It can improve performance by handling asynchronous operations efficiently.
  • It slows down the application by blocking all I/O operations.
  • It has no impact on performance.
  • It can only handle synchronous operations.
The Event Loop in Node.js plays a crucial role in improving performance by efficiently handling asynchronous operations. It allows Node.js to execute non-blocking code, ensuring that the application remains responsive and can handle multiple concurrent requests without getting blocked.