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WITS Innovation Lab Node JS Developer Interview Questions and Answers

Updated 27 Jun 2024

WITS Innovation Lab Node JS Developer Interview Experiences

1 interview found

Interview experience
3
Average
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(2 Questions)

  • Q1. Javascript simple questions
  • Q2. What are Promise
  • Ans. 

    Promises are objects representing the eventual completion or failure of an asynchronous operation.

    • Promises are used to handle asynchronous operations in JavaScript.

    • They can be in one of three states: pending, fulfilled, or rejected.

    • Promises can be chained together using .then() method.

    • They help in avoiding callback hell and writing cleaner asynchronous code.

  • Answered by AI
Round 2 - Coding Test 

Change key value in nested object key is provided

Round 3 - Technical 

(2 Questions)

  • Q1. What is Prototype
  • Ans. 

    Prototype is an object that is associated with every functions and objects by default in JavaScript.

    • Prototype is used to add new properties or methods to existing objects or functions.

    • It allows objects to inherit properties and methods from other objects.

    • Changing the prototype of an object affects all instances of that object.

  • Answered by AI
  • Q2. What's middle ware
  • Ans. 

    Middleware is software that acts as a bridge between different applications or components, allowing them to communicate and interact with each other.

    • Middleware is used to handle tasks such as authentication, logging, error handling, and more in web applications.

    • It can modify incoming requests, outgoing responses, or both.

    • Examples of middleware in Node.js include Express.js middleware like body-parser and morgan.

  • Answered by AI

Skills evaluated in this interview

Node JS Developer Jobs at WITS Innovation Lab

View all

Interview questions from similar companies

I appeared for an interview before May 2016.

Interview Preparation Tips

Round: Test
Experience: The first round had two programming questions and one question of database concepts.
Duration: 1 hour
Total Questions: 3

Round: Technical Interview
Experience: In the first technical interview, I was asked basic questions about the domain and my resume. There was also a lot of emphasis on problem solving abilities since I was asked to solve some puzzles.

Round: Technical Interview
Experience: The second technical interview was a written round where I was asked to code some searching / sorting variants , to test my ability to write quality code.

Round: Technical Interview
Experience: The last and the final round was probably the toughest and I was asked to design databases, with some constraints. I was given ample time to do it and it did take a lot of time. After that, we had some interesting questions about data structures and trees and that was it.

College Name: RNSIT, Bangalore

I appeared for an interview before Aug 2016.

Interview Preparation Tips

Round: Resume Shortlist
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

I applied via Walk-in and was interviewed before May 2020. There were 4 interview rounds.

Interview Questionnaire 

1 Question

  • Q1. For fresher 1 aptitude - percentage,date and time,number system,intrest,work done problems 2 Group discussion 3 HR interview

Interview Preparation Tips

Interview preparation tips for other job seekers - First is usual aptitude after finishing it takes 30 min for result . Next g it is more of generall topic, atlast hr

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...

  • Answered by AI
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I applied via Recruitment Consulltant and was interviewed in May 2024. There were 3 interview rounds.

Round 1 - Aptitude Test 

It is easy to solve the Aptitude question and some identifying outputs of program.

Round 2 - HR 

(2 Questions)

  • Q1. What is class?and write a logic for object in a class.
  • Ans. 

    A class is a blueprint for creating objects in object-oriented programming.

    • A class defines the properties and behaviors of objects.

    • An object is an instance of a class.

    • Example: Class 'Car' can have properties like 'color' and 'model', and behaviors like 'drive' and 'stop'.

  • Answered by AI
  • Q2. 1.swap two numbers without using temp variable 2.Reverse the string.
  • Ans. 

    Swap two numbers without using temp variable and reverse a string without using built-in functions.

    • To swap two numbers without using temp variable, use bitwise XOR operation.

    • To reverse a string without using built-in functions, use two pointers approach.

    • Example for swapping numbers: a = a ^ b; b = a ^ b; a = a ^ b;

    • Example for reversing a string: use two pointers to swap characters from start and end of the string.

  • Answered by AI
Round 3 - Coding Test 

Now, I am preparing for the third round.
So, I don't know the Coding Question.

Interview Preparation Tips

Topics to prepare for ClaySys Software Developer interview:
  • Java, SQL
Interview preparation tips for other job seekers - What you have given in your Resume that will be your Question.
Must Strong in Basics of Java and SQL commands.
Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I applied via Naukri.com and was interviewed in Mar 2023. There were 2 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all tips
Round 2 - Technical 

(5 Questions)

  • Q1. What are oops concepts in java, explain real time scenario
  • Ans. 

    OOPs concepts in Java include inheritance, polymorphism, encapsulation, and abstraction.

    • Inheritance allows a subclass to inherit properties and methods from a superclass.

    • Polymorphism allows objects to take on multiple forms and behave differently based on their context.

    • Encapsulation hides the implementation details of an object and only exposes necessary information.

    • Abstraction allows for the creation of abstract class...

  • Answered by AI
  • Q2. Uses of interface, inheritance
  • Ans. 

    Interfaces define contracts for behavior, while inheritance allows for code reuse and polymorphism.

    • Interfaces allow for loose coupling and abstraction, enabling multiple implementations of the same behavior.

    • Inheritance allows for code reuse and extension of existing classes, reducing code duplication.

    • Polymorphism allows objects of different classes to be treated as if they were of the same class, simplifying code and i

  • Answered by AI
  • Q3. SQL query for join of tables
  • Ans. 

    SQL query for joining tables

    • Use JOIN keyword to combine two or more tables based on a related column

    • Specify the columns to be selected using SELECT keyword

    • Use ON keyword to specify the condition for joining the tables

    • Different types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN

  • Answered by AI
  • Q4. Java concepts used in your project
  • Ans. 

    Used Java concepts such as inheritance, polymorphism, and exception handling in my project.

    • Implemented inheritance to create a base class and derived classes with specific functionalities.

    • Utilized polymorphism to allow objects of different classes to be treated as if they were of the same class.

    • Implemented exception handling to handle errors and prevent program crashes.

    • Used interfaces to define a set of methods that a ...

  • Answered by AI
  • Q5. Overloading vs overriding, practical uses
  • Ans. 

    Overloading is having multiple methods with the same name but different parameters. Overriding is having a method in a subclass with the same name and parameters as a method in the superclass.

    • Overloading is used to provide different ways to call a method with different parameters

    • Overriding is used to provide a specific implementation of a method in a subclass

    • Overloading is resolved at compile-time while overriding is r...

  • Answered by AI

Interview Preparation Tips

Topics to prepare for Zebra Technologies Software Developer interview:
  • Core Java
  • OOPS
  • collection framework
  • Database Management

Skills evaluated in this interview

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Campus Placement and was interviewed in Sep 2024. There were 3 interview rounds.

Round 1 - Aptitude Test 

Logical thinking and quantitative

Round 2 - Coding Test 

One Java and one SQL and one js question

Round 3 - HR 

(3 Questions)

  • Q1. What is collections
  • Ans. 

    Collections are data structures that store and organize multiple elements in a single unit.

    • Collections provide methods to add, remove, and manipulate elements.

    • Examples of collections include arrays, lists, sets, and maps.

    • Collections can be used to efficiently manage and access large amounts of data.

  • Answered by AI
  • Q2. What is constructor
  • Ans. 

    A constructor is a special method in a class that is automatically called when an object of that class is created.

    • Constructors have the same name as the class they belong to

    • They are used to initialize the object's state

    • Constructors can have parameters to customize the initialization process

  • Answered by AI
  • Q3. What is data science
  • Ans. 

    Data science is a field that uses scientific methods, algorithms, and systems to extract knowledge and insights from structured and unstructured data.

    • Data science involves collecting, analyzing, and interpreting large amounts of data to make informed decisions.

    • It combines statistics, machine learning, and domain knowledge to uncover patterns and trends in data.

    • Data scientists use programming languages like Python and R...

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - It was moderate process

Skills evaluated in this interview

Interview experience
5
Excellent
Difficulty level
Hard
Process Duration
More than 8 weeks
Result
No response

I applied via Walk-in and was interviewed before Jun 2023. There was 1 interview round.

Round 1 - Technical 

(2 Questions)

  • Q1. What is interface ?
  • Ans. 

    An interface in software development defines a contract for classes to implement, specifying methods and properties.

    • Interfaces in programming languages like Java and C# allow for multiple inheritance by defining a set of methods that a class must implement.

    • Interfaces provide a way to achieve abstraction and polymorphism in object-oriented programming.

    • Interfaces are used to define common behavior that multiple classes c...

  • Answered by AI
  • Q2. Hat is encapsulation
  • Ans. 

    Encapsulation is the concept of bundling data and methods that operate on the data into a single unit.

    • Encapsulation helps in hiding the internal state of an object and restricting access to it.

    • It allows for better control over the data by preventing direct access from outside the class.

    • Encapsulation promotes code reusability and makes the code easier to maintain.

    • Example: In a class representing a car, the variables lik...

  • Answered by AI

Interview Preparation Tips

Interview preparation tips for other job seekers - Be strong with ur basics

Skills evaluated in this interview

Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Aptitude Test 

10 apti questions and 10 technical mcq on cpp

Round 2 - Technical 

(2 Questions)

  • Q1. Oops concept question
  • Q2. Sql queries on join

WITS Innovation Lab Interview FAQs

How many rounds are there in WITS Innovation Lab Node JS Developer interview?
WITS Innovation Lab interview process usually has 3 rounds. The most common rounds in the WITS Innovation Lab interview process are Technical and Coding Test.
How to prepare for WITS Innovation Lab Node JS Developer interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at WITS Innovation Lab. The most common topics and skills that interviewers at WITS Innovation Lab expect are MySQL, MongoDB, TypeScript, AWS and Microservices.
What are the top questions asked in WITS Innovation Lab Node JS Developer interview?

Some of the top questions asked at the WITS Innovation Lab Node JS Developer interview -

  1. What is Protot...read more
  2. What's middle w...read more
  3. Javascript simple questi...read more

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WITS Innovation Lab Node JS Developer Interview Process

based on 1 interview

Interview experience

3
  
Average
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WITS Innovation Lab Node JS Developer Salary
based on 4 salaries
₹6.1 L/yr - ₹8 L/yr
28% more than the average Node JS Developer Salary in India
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WITS Innovation Lab Node JS Developer Reviews and Ratings

based on 1 review

5.0/5

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5.0

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5.0

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5.0

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5.0

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Node.Js Developer

Mohali

3-8 Yrs

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NodeJs Developer

Mohali,

Punjab

1-5 Yrs

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