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Lucent Innovation Node JS Developer Interview Questions and Answers

Updated 26 Mar 2025

6 Interview questions

A Node JS Developer was asked 2mo ago
Q. What are closures in JavaScript?
Ans. 

Closures are functions that retain access to their lexical scope, even when executed outside that scope.

  • A closure is created when a function is defined inside another function.

  • Closures can access variables from their parent function's scope.

  • They help in data encapsulation and maintaining state.

  • Example: function outer() { let count = 0; return function inner() { count++; return count; }; }

  • Closures are commonly used...

A Node JS Developer was asked 2mo ago
Q. What are the types of variables in JavaScript?
Ans. 

JavaScript has three main types of variables: var, let, and const, each with different scopes and mutability.

  • var: Function-scoped or globally-scoped. Example: var x = 10;

  • let: Block-scoped and can be updated. Example: let y = 20;

  • const: Block-scoped and cannot be reassigned. Example: const z = 30;

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A Node JS Developer was asked 9mo ago
Q. What are promises?
Ans. 

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

  • Promises are used to handle asynchronous operations in a more readable and manageable way.

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

  • Promises can be chained together using .then() to handle success or failure.

  • They help avoid callback hell and make code more maintainable.

  • Example: con...

A Node JS Developer was asked 9mo ago
Q. What are callbacks?
Ans. 

Callbacks are functions passed as arguments to other functions, to be executed later.

  • Callbacks are commonly used in asynchronous programming in Node.js.

  • They allow functions to be executed after another function has finished its execution.

  • Callbacks can be used to handle events, make API calls, or perform other tasks asynchronously.

  • Example: fs.readFile('file.txt', (err, data) => { console.log(data); });

A Node JS Developer was asked 9mo ago
Q. What are closures?
Ans. 

Closures are functions that have access to variables from their outer scope even after the outer function has finished executing.

  • Closures allow functions to access variables from their parent function even after the parent function has returned.

  • They help in maintaining state in JavaScript.

  • Closures are created whenever a function is defined within another function.

A Node JS Developer was asked 9mo ago
Q. What is hoisting in JavaScript?
Ans. 

Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope.

  • Variable and function declarations are hoisted to the top of their scope during the compilation phase.

  • Only declarations are hoisted, not initializations.

  • Function declarations take precedence over variable declarations.

Lucent Innovation Node JS Developer Interview Experiences

2 interviews found

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

(5 Questions)

  • Q1. What is closures
  • Ans. 

    Closures are functions that have access to variables from their outer scope even after the outer function has finished executing.

    • Closures allow functions to access variables from their parent function even after the parent function has returned.

    • They help in maintaining state in JavaScript.

    • Closures are created whenever a function is defined within another function.

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

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

    • Promises are used to handle asynchronous operations in a more readable and manageable way.

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

    • Promises can be chained together using .then() to handle success or failure.

    • They help avoid callback hell and make code more maintainable.

    • Example: const my...

  • Answered by AI
  • Q3. What are callbacks
  • Ans. 

    Callbacks are functions passed as arguments to other functions, to be executed later.

    • Callbacks are commonly used in asynchronous programming in Node.js.

    • They allow functions to be executed after another function has finished its execution.

    • Callbacks can be used to handle events, make API calls, or perform other tasks asynchronously.

    • Example: fs.readFile('file.txt', (err, data) => { console.log(data); });

  • Answered by AI
  • Q4. What is hoisting in JS
  • Ans. 

    Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope.

    • Variable and function declarations are hoisted to the top of their scope during the compilation phase.

    • Only declarations are hoisted, not initializations.

    • Function declarations take precedence over variable declarations.

  • Answered by AI
  • Q5. Nodejs basic questions

Interview Preparation Tips

Interview preparation tips for other job seekers - just basics, be sure your logic is clear

Skills evaluated in this interview

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I appeared for an interview before Mar 2024, where I was asked the following questions.

  • Q1. What are closures in JavaScript?
  • Ans. 

    Closures are functions that retain access to their lexical scope, even when executed outside that scope.

    • A closure is created when a function is defined inside another function.

    • Closures can access variables from their parent function's scope.

    • They help in data encapsulation and maintaining state.

    • Example: function outer() { let count = 0; return function inner() { count++; return count; }; }

    • Closures are commonly used in c...

  • Answered by AI
  • Q2. What are the types of variables in JavaScript?
  • Ans. 

    JavaScript has three main types of variables: var, let, and const, each with different scopes and mutability.

    • var: Function-scoped or globally-scoped. Example: var x = 10;

    • let: Block-scoped and can be updated. Example: let y = 20;

    • const: Block-scoped and cannot be reassigned. Example: const z = 30;

  • Answered by AI

Skills evaluated in this interview

Top trending discussions

View All
Interview Tips & Stories
1w (edited)
a team lead
Why are women still asked such personal questions in interview?
I recently went for an interview… and honestly, m still trying to process what just happened. Instead of being asked about my skills, experience, or how I could add value to the company… the questions took a totally unexpected turn. The interviewer started asking things like When are you getting married? Are you engaged? And m sure, if I had said I was married, the next question would’ve been How long have you been married? What does my personal life have to do with the job m applying for? This is where I felt the gender discrimination hit hard. These types of questions are so casually thrown at women during interviews but are they ever asked to men? No one asks male candidates if they’re planning a wedding or how old their kids are. So why is it okay to ask women? Can we please stop normalising this kind of behaviour in interviews? Our careers shouldn’t be judged by our relationship status. Period.
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Ask anonymously on communities.

Interview questions from similar companies

Interview experience
4
Good
Difficulty level
Easy
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Recruitment Consulltant and was interviewed before Apr 2022. There were 3 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 - Aptitude Test 

25 MCQ questions online with time limit

Round 3 - Assignment 

Create webapp . Frontend, Backend , data encryption

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I appeared for an interview before Mar 2024.

Round 1 - Aptitude Test 

The aptitude test mainly covered logical reasoning, quantitative aptitude, and basic programming concepts. Questions were of moderate difficulty, with some time-based problem-solving challenges. Practicing common aptitude topics like puzzles, numerical ability, and coding fundamentals can help in preparation.

Round 2 - Group Discussion 

The group discussion round focused on general topics related to technology, current affairs, and workplace scenarios. The evaluators were looking for clarity of thought, communication skills, and how well candidates could present their points while engaging with others. Staying confident and actively participating helped in getting selected.

Interview Preparation Tips

Interview preparation tips for other job seekers - Be consistent and work hard
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

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

Round 1 - Aptitude Test 

Aptitude questions with some basic coding questions

Round 2 - Coding Test 

They have given 3 coding questions and some pseudo codings

Round 3 - Technical 

(2 Questions)

  • Q1. Tell about your self
  • Q2. Some coding questions

Interview Preparation Tips

Interview preparation tips for other job seekers - be confident

I applied via Naukri.com and was interviewed in May 2021. There was 1 interview round.

Interview Questionnaire 

4 Questions

  • Q1. To find if a number is Prime or not and optimise your written code.
  • Ans. 

    Check if a number is prime and optimize the code.

    • Start by checking if the number is less than 2, in which case it is not prime.

    • Iterate from 2 to the square root of the number and check if any of them divide the number evenly.

    • If a divisor is found, the number is not prime. Otherwise, it is prime.

  • Answered by AI
  • Q2. Css question related to flex box, Grid and cross browser compatibility
  • Q3. To call an API in react and optimise your written code.
  • Ans. 

    To optimise API calls in React, use asynchronous functions and caching techniques.

    • Use async/await to handle API calls

    • Implement caching to reduce network requests

    • Use memoization to avoid unnecessary re-renders

    • Consider using a state management library like Redux

    • Use performance profiling tools like React DevTools

  • Answered by AI
  • Q4. Questions on JS concepts like Objects and Prototype Inheritance.

Interview Preparation Tips

Interview preparation tips for other job seekers - Know your basic concepts and prepare well for the interview.

Skills evaluated in this interview

I applied via Campus Placement

Round 1 - Coding Test 

Online Coding Test included some aptitude questions, technical questions followed by 3 coding questions

Round 2 - Technical 

(1 Question)

  • Q1. My technical interview included an introduction about myself followed by my background, projects I've made, internships I've done, and in which language I was comfortable. and the interviewer asked me to w...

Interview Preparation Tips

Interview preparation tips for other job seekers - Answer confidently and give examples. and you can also connect the questions asked to your past projects.
Are these interview questions helpful?

Software Developer Interview Questions & Answers

Snovasys user image 218A1A05A9 GOGATI GOVARDHAN

posted on 1 Nov 2024

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
Not Selected

I applied via Campus Placement and was interviewed in Oct 2024. There were 2 interview rounds.

Round 1 - Aptitude Test 

(2 Questions)

  • Q1. Number series in aptitude
  • Ans. 

    Number series in aptitude involves identifying the pattern in a sequence of numbers and predicting the next number.

    • Look for patterns such as arithmetic progression, geometric progression, or a combination of both.

    • Check for alternate numbers, differences between consecutive numbers, or multiplication factors.

    • Consider prime numbers, squares, cubes, or other mathematical operations applied to the series.

    • Example: 2, 4, 6, ...

  • Answered by AI
  • Q2. Relation ships in berbal
  • Ans. 

    Relationships in verbal communication are crucial for effective collaboration and understanding.

    • Verbal communication involves both verbal and non-verbal cues

    • Active listening is key to building strong relationships in verbal communication

    • Clarity and conciseness in speech can enhance relationships

    • Empathy and understanding of others' perspectives are important in verbal relationships

  • Answered by AI
Round 2 - Technical 

(2 Questions)

  • Q1. Explain the four branches of oops
  • Ans. 

    The four branches of OOP are encapsulation, inheritance, polymorphism, and abstraction.

    • Encapsulation: Bundling data and methods that operate on the data into a single unit.

    • Inheritance: Allowing a class to inherit properties and behavior from another class.

    • Polymorphism: The ability for objects of different classes to respond to the same method call.

    • Abstraction: Hiding the complex implementation details and showing only ...

  • Answered by AI
  • Q2. Explain about the structures in c
  • Ans. 

    Structures in C are user-defined data types that allow grouping of variables of different data types under a single name.

    • Structures are used to represent a record which consists of different data types.

    • They are defined using the 'struct' keyword.

    • Each variable in a structure is called a member.

    • Structures can be nested within other structures.

    • Example: struct employee { int emp_id; char emp_name[50]; float emp_salary; };

    • E...

  • Answered by AI

Skills evaluated in this interview

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

I appeared for an interview in Feb 2025.

Round 1 - Coding Test 

They asked one coding question that is for star pattern question

Interview Preparation Tips

Interview preparation tips for other job seekers - prepare for pattern auestions and java
Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Company Website and was interviewed in Jul 2023. There were 4 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 - Coding Test 

I have given the coding test in python language. Out of 5 questions, we have to attain a minimum of 3 questions.

Round 3 - Technical 

(1 Question)

  • Q1. The questions in technical round is related to the task which were given to us and also they ask basics questions related to technical.
Round 4 - HR 

(1 Question)

  • Q1. The interview was about the personality check, overeally it was good .

Interview Preparation Tips

Interview preparation tips for other job seekers - This is the best place for the freshers to start their career.

Lucent Innovation Interview FAQs

How many rounds are there in Lucent Innovation Node JS Developer interview?
Lucent Innovation interview process usually has 1 rounds. The most common rounds in the Lucent Innovation interview process are Technical.
How to prepare for Lucent Innovation 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 Lucent Innovation. The most common topics and skills that interviewers at Lucent Innovation expect are Javascript, MongoDB, MySQL, NoSQL and Clinical SAS Programming.
What are the top questions asked in Lucent Innovation Node JS Developer interview?

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

  1. What are the types of variables in JavaScri...read more
  2. What are closures in JavaScri...read more
  3. What is hoisting in...read more

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Overall Interview Experience Rating

5/5

based on 2 interview experiences

Difficulty level

Moderate 100%

Duration

Less than 2 weeks 100%
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