Ask your junior node js developer junior applicants some of these 24 beginner Node.js interview questions to test their knowledge and abilities. In Node.js, spawn () launches a new process with the available set of commands. This doesn’t generate a new V8 instance; only a single copy of the node module is active on the processor. This method can be used when your child process returns a large amount of data to the node. Node.js has an EventEmitter class which holds all the objects which can emit events.
How do you ensure a website or application is responsive across different devices?
Another instance was when I worked on a project that required real-time weather data. For this, I integrated the OpenWeatherMap API, which allowed us to fetch current weather conditions and forecasts based on user location. This integration not only improved the user experience but also provided valuable information for other features within the application.
- A few examples they might mention include buffers, consoles, and processes.
- A developer who wants to improve their skills is a great match for your organization, so consider if your candidates aim to grow.
- The setInterval() function is used to execute a function repeatedly, with a fixed time delay between each call.
- Implicit type coercion in javascript is the automatic conversion of value from one data type to another.
- The purpose of these questions is for the firm to assess your level of knowledge and skill, and approach to various situations.
- This illustrates how module.exports enables us to share functionality between modules in Node.js.
- Client-side frameworks allow one to develop advanced web applications like Single-Page-Application.
Middle JavaScript Developer Node.js
If you use a compiler like Babel, you can mix and match module formats. And then join them together from the main module to achieve the desired result. Of course returning will help the context calling async function get the value returned by callback. LTS or Long-Term Support is applied to release lines supported and maintained by the Node.js project for an extended period. When we run the program then, first of all, the spring container gets started. After that, the container creates the instance of a bean as per the request, and then dependencies are injected.
Q1. What types of Node.js interview questions can I expect?
DNS is a node module used to do name resolution facility which is provided by the operating system as well as used to do an actual DNS lookup. Its main advantage is that there is no need for memorizing IP addresses – DNS servers provide a nifty solution for converting domain or subdomain names to IP addresses. More suitable for CPU-heavy operations but can be less performant in handling high concurrency compared to NodeJS. Built on Python, which is synchronous by default, but can also be used for asynchronous programming.
- In contrast, promises are objects that represent the result of an asynchronous operation.
- An example of multi-threading in Node.js is in the following code snippet where the “crypto” module is used.
- However, it also requires a deeper understanding of types and can introduce additional overhead.
- Each Node.js online test is powered by the RealLifeTesting™ methodology.
The system then executes the function when the user triggers the event. Stubs are programs or functions used to stimulate component behavior. The crypto module in Node.js is used for cryptography, i.e., it includes a set of wrappers for the open SSL's hash, HMAC, sign, decipher, cipher, and verify functions.
In Node Js, the command line can run scripts, install Coding packages, and more. These Node Js interview questions are for candidates starting out in web development and Node Js. They may have just cleared college or be in the early stages of their web development career.
The modularization option can be used to execute the import of objects, classes, functions, modules, and external files. In this example, the first middleware logs the incoming requests, and the second middleware handles errors. The next() function is called to pass control to the next middleware in the chain or the route handler. Middleware allows for modularizing application logic and making the code more maintainable. Fork is a method in NodeJS that is used to create child processes. It creates a new instance of the engine which enables multiple processes to run the code.
How do We prevent SQL Server from giving We informational messages during and after a SQL statement execution?
Django framework efficiently handles and generates dynamic HTML web pages that are visible to the end-user. Yes, We can create an index on a field containing an array value to improve performance for queries on that field. When We create an index on a field containing an array value, MongoDB stores that index as a multikey index. The MongoDB database had several scalar data formats that were of special interest only for MongoDB, hence they developed the BSON data format to be used while transferring files over the network. In SQL Server, informational messages, often called "info" or "print" messages, can be generated during and after the execution of a SQL statement. These messages might include details such as the number of rows affected or certain warnings.