NodeJS Interview Questions and Answers
Question - 11 : - What is the order of execution in control flow statements?
Answer - 11 : - The following is the order in which control flow statements are used to process function calls:
• Handling execution and queue
• Data collection and storage
• Concurrency handling and limiting
• Execution of the next piece of code
Question - 12 : - What are the input arguments for an asynchronous queue?
Answer - 12 : - There are two main arguments that an asynchronous queue uses. They are:
• Concurrency value
• Task function
Question - 13 : - Are there any disadvantages to using Node.js?
Answer - 13 : - A multi-threaded platform can run more effectively and provide better responsiveness when it comes to the execution of intensive CPU computation, and the usage of relational databases with Node.js is becoming obsolete already.
Question - 14 : - What is the primary reason to use the event-based model in Node.js?
Answer - 14 : - The event-based model in Node.js is used to overcome the problems that occur when using blocking operations in the I/O channel.
Next up on these Node js interview questions, need to understand how you can import libraries into Node.js.
Question - 15 : - How can you import external libraries into Node.js?
Answer - 15 : - External libraries can be easily imported into Node.js using the following command:
var http=require (“http”)
This command will ensure that the HTTP library is loaded completely, along with the exported object.
Next among the Node js questions, you need to know about event-driven programming.
Question - 16 : - What is meant by event-driven programming in Node.js?v
Answer - 16 : - Event-driven programming is a technique in which the workflow execution of a program is mainly controlled by the occurrence of events from external programs or other sources.
The event-driven architecture consists of two entities, namely:
• Event handling
• Event selection
Question - 17 : - What is the framework that is used majorly in Node.js today?
Answer - 17 : - Node.js has multiple frameworks, namely:
• Hapi.js
• Express.js
• Sails.js
• Meteor.js
• Derby.js
• Adonis.js
Among these, the most used framework is Express.js for its ability to provide good scalability, flexibility, and minimalism
Question - 18 : - What are the security implementations that are present in Node.js?
Answer - 18 : - Following are the important implementations for security:
• Error handling protocols
• Authentication pipelines
Question - 19 : - What is the meaning of a test pyramid?
Answer - 19 : - A test pyramid is a methodology that is used to denote the number of test cases executed in unit testing, integration testing, and combined testing (in that order). This is maintained to ensure that an ample number of test cases are executed for the end-to-end development of a project.
Next up on these Node js interview questions, it is vital that you know about Libuv. Read on.
Question - 20 : - What is libuv?
Answer - 20 : - Libuv is a widely used library present in Node.js. It is used to complement the asynchronous I/O functionality of Node.js. It was developed in-house and used alongside systems such as Luvit, Julia, and more.
Following are some of the features of libuv:
• File system event handling
• Child forking and handling
• Asynchronous UDP and TCP sockets
• Asynchronous file handling and operations
Next among the Node js questions, you need to understand a question about the functioning of Google Chrome.