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Interview Question and Answers of Node.js

 If you want to aspire to your career as a node.js developer, prepare for your interview with these interview-related questions and answers. It's a perfect choice for you, and when you face an interview with preparation, it seems a little less challenging to you. Here some of the frequent questions and answers sample for both beginners and experts.


1.     What is node.js?

Node.js is a chrome-based v8 engine and a server-side scripting tool. It’s an efficient and lightweight I/O model.  It’s mostly performance-based JavaScript which transforms the js code to a native machine code. Also, it's executed for the system process. It runs with Brave, Vivaldi, Opera browsers, and there is an http library too. 


2.     How to handle child threads in Node.js?

Node.js doesn’t express any mode of thread management as it’s a single thread process. Child threads in Node.js are created in more than one stage, and asynchronous I/O is one reason. It can run on the backdrop and never generate any blockage when making the actual code.



3.     Is Node.js the right stage for developing CPU-intensive applications?

Node.js is performed well with server-side application development, but CPU-heavy applications do not support it. As the threads are pushed through crucial execution by the CPU-intensive programs, it delays the incoming requests.


4.     Why are the main advantages of using the Express JS Package?

Express JS Package defines an important role in information flow. This framework is mainly utilized for controlling the transformation among server sides platforms and routers. The advanced Express JS Package contains flexible, lightweight, and a lot of other features. It's a perfect option for improving web and smartphone applications.


5.     What is JIT, and is there any importance of JIT in Node.js?

Just-in-time or JIT transforms bytecode into instructions, and it's a part of the runtime component which sends the code to the processor. After completing the code writing part, the source language statements are converted into bytecode with compilation.

Yes, JIT maintains a vital role in Node.js as it innovates the code generation speed significantly. It has the power of converting the source code into machine code immediately in run-time.


6.     What is the main concept of the test pyramid?

Test pyramid describes the ratio of integration measures and unit-tests in the form of a diagram. It’s must be written to complete a project successfully.


7.     Why the module are exports used?

In Node.js, the purpose of a module. Exports are to compile all essential codes into a single unit. It can express by transferring the relevant actions into a file later.


8.     What is the main difference between front-end and back-end development?

Front-end development is a user interface where the back-end development defines the combination of applications, servers, and database. People can use the front-end and back-end development functions from behind to provide the basic info.


9.     What is chaining?

Chaining is a process by which the output of a stream is counted to another stream. It also builds a technical chain of different stream functions. 


10  What is the process of controlling flow works?

A control flow is a type of code that executes the asynchronous function. The general measures for conducting control flow are like the below-

·       It maintains the order of execution.

·       Collects the essential data.

·       Synchronization should be kept to a minimum.

·       It helps to invoke the program.

 

11   What is the process of assert in Node.js?

Assert in Node.js are mainly utilized to explain the test cases. It's only used to deliver feedback after a failing test case. This module consists of a great list of assertion tests, and it's helpful for test invariants. This assertion is applicable in Node.js internally and in other applications with the assert code.  

 

12  Is there any difference between node.js and Ajax?

Yes, there is one main difference between node.js and Ajax. Where node.js is server-side software, ajax is a client-side application. Ajax is used to update any webpage, content and there is no need to refresh it simultaneously. But Ajax technology is used mainly in servers rather than webpages.


13  Can you do cryptography by node.js?

Cryptography is supported by a module described as crypto in Node.js. this crypto module serves more than one cryptographic functionality named decipher, cipher, and functions verifying, etc.


14   What is the purpose of consoling objects?

Information is printed on stderr and stdout utilizing the console object.

 

 

 

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Digital Marketing FAQs

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