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Virtual Height IT Services Node JS Developer Interview Questions and Answers
7 Interview questions
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.
Variable and function declarations are hoisted to the top of their scope.
Only declarations are hoisted, not initializations.
Function declarations take precedence over variable declarations.
JavaScript is a high-level, interpreted programming language used for creating interactive websites and web applications.
JavaScript is often used for client-side scripting to make web pages interactive.
It can also be used for server-side development with Node.js.
JavaScript is versatile and can be used for creating games, mobile apps, and more.
Callback hell is a situation in asynchronous JavaScript programming where multiple nested callbacks make the code difficult to read and maintain.
Occurs when multiple asynchronous operations are nested within each other
Leads to deeply nested code structure which is hard to read and debug
Can be avoided by using promises, async/await, or modularizing code
Asynchronous nature in Node JS refers to the ability of the program to execute multiple tasks simultaneously without blocking the main thread.
Allows non-blocking I/O operations, improving performance and scalability
Uses event-driven architecture to handle multiple requests concurrently
Uses callbacks, promises, and async/await for handling asynchronous operations
Async await in Node.js is a feature that allows you to write asynchronous code in a synchronous manner.
Async await is built on top of Promises in Node.js.
It allows you to write asynchronous code that looks like synchronous code, making it easier to read and maintain.
The 'async' keyword is used to define a function as asynchronous, while the 'await' keyword is used to wait for a Promise to resolve before continuing...
Closures are functions that have access to their own scope, as well as the scope in which they were defined.
Closures allow functions to access variables from their outer scope even after the outer function has finished executing.
They are commonly used in event handlers, callbacks, and in functional programming.
Example: const outerFunction = () => { const outerVar = 'I am outer'; return () => { console.log(outerVar...
Spread operator allows an iterable to be expanded in places where zero or more arguments or elements are expected. Rest operator collects all the remaining elements into an array.
Spread operator is denoted by three dots (...) and is used to expand elements of an iterable like an array or object.
Rest operator is also denoted by three dots (...) and is used to collect multiple elements into a single array.
Spread ope...
Virtual Height IT Services Node JS Developer Interview Experiences
1 interview found
Selected
I applied via Approached by Company and was interviewed before Apr 2023. There was 1 interview round.
(8 Questions)
- Q1. What is hoisting
- Ans.
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.
Variable and function declarations are hoisted to the top of their scope.
Only declarations are hoisted, not initializations.
Function declarations take precedence over variable declarations.
- Q2. What is clousers
- Ans.
Closures are functions that have access to their own scope, as well as the scope in which they were defined.
Closures allow functions to access variables from their outer scope even after the outer function has finished executing.
They are commonly used in event handlers, callbacks, and in functional programming.
Example: const outerFunction = () => { const outerVar = 'I am outer'; return () => { console.log(outerVar); };...
- Q3. What is javascript
- Ans.
JavaScript is a high-level, interpreted programming language used for creating interactive websites and web applications.
JavaScript is often used for client-side scripting to make web pages interactive.
It can also be used for server-side development with Node.js.
JavaScript is versatile and can be used for creating games, mobile apps, and more.
- Q4. What is spread operator and rest operator in js
- Ans.
Spread operator allows an iterable to be expanded in places where zero or more arguments or elements are expected. Rest operator collects all the remaining elements into an array.
Spread operator is denoted by three dots (...) and is used to expand elements of an iterable like an array or object.
Rest operator is also denoted by three dots (...) and is used to collect multiple elements into a single array.
Spread operator...
- Q5. What is call back
- Q6. What us callback hell
- Ans.
Callback hell is a situation in asynchronous JavaScript programming where multiple nested callbacks make the code difficult to read and maintain.
Occurs when multiple asynchronous operations are nested within each other
Leads to deeply nested code structure which is hard to read and debug
Can be avoided by using promises, async/await, or modularizing code
- Q7. What do you mean by asyc nature
- Ans.
Asynchronous nature in Node JS refers to the ability of the program to execute multiple tasks simultaneously without blocking the main thread.
Allows non-blocking I/O operations, improving performance and scalability
Uses event-driven architecture to handle multiple requests concurrently
Uses callbacks, promises, and async/await for handling asynchronous operations
- Q8. What is asyc await in node
- Ans.
Async await in Node.js is a feature that allows you to write asynchronous code in a synchronous manner.
Async await is built on top of Promises in Node.js.
It allows you to write asynchronous code that looks like synchronous code, making it easier to read and maintain.
The 'async' keyword is used to define a function as asynchronous, while the 'await' keyword is used to wait for a Promise to resolve before continuing.
Usin...
Interview Preparation Tips
- Javascript
- Node.Js
Skills evaluated in this interview
Top trending discussions
Interview questions from similar companies
I appeared for an interview before Aug 2016.
Interview Preparation Tips
Experience: I am vinothkumar from Dindugal, I was studied computer engineering in Madurai institute of engineering and technology at sivagangai, I am quality controller in RR DONNELLY at Chennai, my experience 2 years, my family staying in native, my father palanichami he is a former, my mother tamilselvi she is home maker and my one yelder brother Vijayakumar he is driver, I am interested area software engineer, my hobbies are listening music, reading book and news paper, playing and watching cricket
Tips: No comments
Round: Test
Experience: I am vinothkumar from Dindugal, I was studied computer engineering in Madurai institute of engineering and technology at sivagangai, I am quality controller in RR DONNELLY at Chennai, my experience 2 years, my family staying in native, my father palanichami he is a former, my mother tamilselvi she is home maker and my one yelder brother Vijayakumar he is driver, I am interested area software engineer, my hobbies are listening music, reading book and news paper, playing and watching cricket
Tips: No comments
Total Questions: 15
Round: Test
Experience: See my mentality
Tips: No comments
Duration: 45 minutes
Round: Group Discussion
Experience: Communication
Tips: No comments
Skills: Communication And Confidence
Interview Questionnaire
1 Question
- Q1. Difference between for and for each
- Ans.
For loop is used for iterating over a range of values while for each loop is used for iterating over elements of an array.
For loop is used when the number of iterations is known beforehand.
For each loop is used when the number of iterations is not known beforehand.
For loop can be used with any iterable object.
For each loop can only be used with arrays and other iterable objects.
For loop uses an index variable to access...
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(2 Questions)
- Q1. Not good with my situation And
- Q2. What is your current salary What is your location
- Ans.
I am unable to provide my current salary as it is confidential.
My current salary is confidential and I am unable to disclose it.
I prefer to discuss salary expectations rather than disclosing my current salary.
Salary is negotiable based on the position and responsibilities.
I am more interested in discussing the opportunities and growth potential in this role.
Interview Preparation Tips
I applied via Campus Placement and was interviewed in Dec 2023. There were 2 interview rounds.
Give a pattern and solved people enter into techinal round 1.I cleard this test and enter to tr1
(1 Question)
- Q1. They ask executye some patterns anf basic programs.i performed but don't select to tr2
Interview Preparation Tips
- Design Patterns
- Basic programs
I appeared for an interview in Feb 2025.
They asked one coding question that is for star pattern question
Interview Preparation Tips
(1 Question)
- Q1. Project discussion
Software Developer Interview Questions & Answers
Apmosys Technologies
Anonymous
posted on 24 Apr 2024
I applied via Campus Placement and was interviewed in Oct 2023. There were 3 interview rounds.
It was online 60min test.
It was offline 30 min test.
(2 Questions)
- Q1. Oops,dbms,css,html,dsa,java.
- Q2. It was very friendly .
Interview Preparation Tips
- Java
Software Developer Interview Questions & Answers
Apmosys Technologies
Anonymous
posted on 26 Apr 2024
Selected
I applied via Campus Placement and was interviewed before Apr 2023. There was 1 interview round.
(6 Questions)
- Q1. What are the 4 principles of oops?
- Ans.
The 4 principles of OOP are Inheritance, Encapsulation, Abstraction, and Polymorphism.
Inheritance allows a class to inherit properties and behavior from another class.
Encapsulation restricts access to certain components within a class, protecting the data.
Abstraction hides complex implementation details and only shows the necessary features.
Polymorphism allows objects to be treated as instances of their parent class.
- Q2. What is the difference between string buffer and string builder?
- Ans.
String buffer is synchronized and thread-safe, while string builder is not synchronized and faster.
String buffer is synchronized, making it thread-safe for use in multi-threaded environments.
String builder is not synchronized, providing better performance in single-threaded applications.
String builder is faster than string buffer due to lack of synchronization overhead.
Example: StringBuffer sb = new StringBuffer(); Str...
- Q3. Why strings are immutable?
- Ans.
Strings are immutable in order to ensure data integrity and security.
Immutable strings prevent accidental data modification, ensuring data integrity.
Immutable strings enhance security by preventing unauthorized access or tampering.
Immutable strings allow for more efficient memory management and optimization.
Example: 'Hello' cannot be changed to 'Hella' directly, a new string must be created.
- Q4. What are the different types of exception in java?
- Ans.
There are two types of exceptions in Java: checked exceptions and unchecked exceptions.
Checked exceptions are checked at compile time and must be handled using try-catch or throws keyword.
Unchecked exceptions are not checked at compile time and include RuntimeException and its subclasses.
Examples of checked exceptions include IOException, SQLException, and ClassNotFoundException.
Examples of unchecked exceptions include...
- Q5. Explain linear search algorithm.
- Ans.
Linear search is a simple searching algorithm that sequentially checks each element in a list until a match is found.
Iterate through each element in the list
Compare the current element with the target value
Return the index if a match is found, otherwise return -1
- Q6. Difference between JDK jvm and jre
- Ans.
JDK includes JRE and development tools, while JRE includes only the Java Runtime Environment.
JDK stands for Java Development Kit, which includes JRE and development tools like compilers and debuggers.
JRE stands for Java Runtime Environment, which includes JVM and libraries necessary to run Java applications.
JVM stands for Java Virtual Machine, which is responsible for executing Java bytecode.
JDK is used for developing ...
Interview Preparation Tips
Skills evaluated in this interview
Koushik
Selected
I applied via Campus Placement and was interviewed in Sep 2024. There were 3 interview rounds.
Aptitude questions with some basic coding questions
They have given 3 coding questions and some pseudo codings
(2 Questions)
- Q1. Tell about your self
- Q2. Some coding questions
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