Posted on June 8, 2022 at 12:51 PM
To be consistent, we will begin the article by reviewing the basic Node.JS developer job interview questions and answers that you can ask junior engineers. These questions can be requested at the start of the interview after the candidates introduce themselves.
First and foremost, this is an excellent strategy for getting to know the developer as a person. The way they respond to questions, stop and start thinking, and other minor nuances like this can reveal a lot about the Node.js developer, particularly the amount of effort they put into learning the subject.
Another reason why these fundamental Node.JS developer job interview questions are significant is that they allow you to assess your degree of Node.JS understanding. After considering the candidate’s degree of qualification, you can pick what difficult questions to pose to the developers later.
In general, it’s critical not to dismiss the fundamental questions just because they’re “simple” or “unimportant.” The truth is that the questions about entry-level Node.JS developers in the interview can be more essential than the advanced ones – in the end, they define the path of the rest of the interview.
Node.js is a modern server-side technology used by an increasing number of businesses. If you have a job interview, it is advised to brush up on your interview skills ahead of time. Although a few general Node.js developer interview questions are asked during all sorts of interviews, we recommend that you prepare by concentrating on questions relevant to your sector.
We’ve collected a comprehensive list of the most popular Node.js developer job interview questions and the best ways to answer them. It will help you comprehend the essential concepts of Node.js.
It is, without a doubt, the most fundamental question about Node.JS. Naturally, this is frequently the first or one of the first questions asked in an interview.
Even experienced Node.JS developers have difficulty answering this question smoothly. When developers are entirely immersed in Node.JS work, they do not always consider what it is. It is frequently difficult to define this tool in a single short line.
We may say that this is the most cost-effective version.
It is among the more subjective Node.JS developer job interview questions. The candidate should convey their thoughts on the instrument and its advantages. There are so many that the candidate will most likely discuss those that interest them or benefit them the most.
Here are some possible responses: It is quick, asynchronous, and offers a single, generalized programming language and data type, among other benefits.
One of those Node.JS questions may catch the developer off guard because it is unrelated to Node JS. It should be a simple question for developers. It all boils down to how they would phrase the response.
Front-end developers work on the web page’s client (user) side. They work on, develop, and support everything that the client sees – in other words; they are in charge of the page’s visual design and functional (for example, buttons, banners, and so on) components. On the other hand, back-end developers concentrate on activities that run in the background and are not visible to clients. They are likewise in charge of the site’s functionality.
Stubs are functions that replicate the functionality of specific modules. They are frequently used in tests since they can answer problems that may arise in the modules.
Node.js lets you create scalable network apps very quickly. Some of its advantages are as follows:
A Node.js web server often has a unique process. Let’s take a closer look at this process flow.
To interact with the web application, clients make requests to the webserver. Non Blocking or blocking requests are possible:
For async processing, Node.js is single-threaded. Instead of the conventional thread-based design, performing async processing on a single thread under typical site loads can improve performance and scalability.
A callback function is invoked upon the completion of a job. It permits other codes to continue in the meanwhile and avoids blocking. Node.js is an asynchronous platform that mainly relies on callbacks. Node’s APIs are all designed to support callbacks.
Asynchronous logic’s control flow is more detailed and structured.
I/O refers to a program, process, or device that transports data to or from one media and to another.
Every transfer involves the output of one medium and the input of another. A physical device, a network, or files within a system can all serve as the medium.
Event-driven programming is a method of initiating numerous functions that strongly rely on events. An event can range from anything like a mouse click to a keystroke. A callback function already registered with the element is executed when an event occurs. This method is mainly based on the publish-subscribe pattern. Node.js is faster than other technologies due to event-driven programming.
In Node.js, an event loop handles all asynchronous callbacks in an application. It is a significant component of Node.js and the cause for nonblocking I/O in Node.js. Because Node.js is an event-driven language, you can easily connect a listener to an event, and when the event happens, the listener will execute the callback. When functions such as setTimeout, http.get, and fs.readFile is invoked, Node.js runs the event loop and then continues with the code without waiting for the output. When the operation is complete, Node.js receives the result and executes the callback function. It is why, in a loop, all callback functions are queued. They are carried out one by one after receiving the response.
REPL is an abbreviation for reading, Eval, Print, and Loop in Node.js. It symbolizes a computer environment, such as a window console or a Unix/Linux shell, in which any command can be input, and the system will respond with an output. By default, Node.js includes a REPL environment. REPL is capable of the following tasks:
Eval: Receives the data structure and evaluates it.
Print: This command prints the final output.
Loop: Recursively executes the specified command until CTRL+C is pushed twice.
Streams are EventEmitter entities that can work with streaming data in Node.js. They can be used to handle and manipulate huge files (videos, mp3, etc.) streamed over the network. They make use of buffers for temporary storage.
The stream is divided into the following categories:
Writable: data-writing streams (for example, fs.createWriteStream()).
Readable: data streams that can be read (for example, fs.createReadStream()).
Duplex streams can be read and written in both directions (for example, net.Socket).
Duplex streams can change or transform data as written and read (for example, Zlib.createDeflate()).
Middleware is the software that sits between your request and the business logic. It is mainly used to record logs and enable rate limiting, routing, authentication, and anything else that is not part of business logic. Third-party middleware, such as body-parser, is available, and you can develop your middleware for a specific use case.
The reactor pattern is yet another pattern for nonblocking I/O operations. However, this is commonly utilized in any event-driven design.
There are two parts to this: 1. Handler 2. Reactor
Reactor: Its job is to route the I/O event to the proper handlers.
Handler: Its responsibility is to work on such events.
If you want to recruit a Node.JS developer, you should know what questions to ask. You must know what to expect from the candidate if you review the questions and answers offered in this guide. For more information visit the website Relinns.
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