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Ernst & Young React Developer Interview Questions and Answers

Updated 4 Apr 2022

17 Interview questions

🔥 Asked by recruiter 2 times
A React Developer was asked
Q. Can you explain hoisting in JavaScript?
Ans. 

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

  • Variable declarations are hoisted to the top of their scope but not their assignments.

  • Function declarations are fully hoisted, meaning they can be called before they are declared.

  • Hoisting can lead to unexpected behavior if not understood properly.

A React Developer was asked
Q. How can we structure the top-level directories in Redux?
Ans. 

Top-level directories in Redux should be structured based on functionality and feature modules.

  • Separate directories for actions, reducers, and components

  • Group related functionality together in separate directories

  • Use feature modules to encapsulate related actions, reducers, and components

  • Example: 'actions', 'reducers', 'components', 'utils', 'constants'

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A React Developer was asked
Q. What is the Combine Reducer in Redux?
Ans. 

Combine Reducer is a function in Redux that combines multiple reducers into a single reducer function.

  • Combines multiple reducers into a single reducer function

  • Helps manage different pieces of state in Redux store

  • Improves code organization and maintainability

  • Example: combineReducers({ reducer1, reducer2 })

  • Example: const rootReducer = combineReducers({ reducer1, reducer2 })

A React Developer was asked
Q. How is Relay different from Redux?
Ans. 

Relay is a GraphQL client specifically designed for React, while Redux is a state management library for any JavaScript application.

  • Relay is tightly integrated with GraphQL, making it easier to fetch and manage data from a GraphQL server.

  • Redux is a more general-purpose state management library that can be used with any backend technology.

  • Relay uses a declarative approach to data fetching, where components declare ...

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A React Developer was asked
Q. What are the advantages of using Redux?
Ans. 

Redux helps manage application state in a predictable way.

  • Centralized state management

  • Predictable state changes with actions and reducers

  • Time-travel debugging with Redux DevTools

  • Ecosystem of middleware for additional functionality

A React Developer was asked
Q. What are props in React?
Ans. 

Props in React are used to pass data from a parent component to a child component.

  • Props are read-only and cannot be modified by the child component.

  • Props are passed down the component tree.

  • Props can be any type of data, such as strings, numbers, objects, or functions.

  • Example: <ChildComponent name='John' age={25} />

A React Developer was asked
Q. What are the key differences between mapStateToProps() and mapDispatchToProps() in Redux?
Ans. 

mapStateToProps() is used to access the Redux state in a component, while mapDispatchToProps() is used to dispatch actions to update the state.

  • mapStateToProps() is used to access the Redux state and return data as props for a component.

  • mapDispatchToProps() is used to dispatch actions to update the Redux state.

  • mapStateToProps() is a function that takes the current state as an argument and returns an object with pro...

Are these interview questions helpful?
A React Developer was asked
Q. What is reconciliation in ReactJS?
Ans. 

Reconciliation in ReactJS is the process of updating the DOM to match the virtual DOM after a component's state or props have changed.

  • Reconciliation is the algorithm React uses to update the UI efficiently.

  • It compares the virtual DOM with the actual DOM and only updates the parts that have changed.

  • Reconciliation is a key feature that helps React achieve high performance.

  • Example: When a user interacts with a React ...

A React Developer was asked
Q. What is a first-class function in JavaScript?
Ans. 

A first-class function in JavaScript is a function that can be treated like any other variable.

  • Can be passed as an argument to other functions

  • Can be returned from other functions

  • Can be assigned to variables

  • Can be stored in data structures

A React Developer was asked
Q. How would you sort an array of integers in JavaScript?
Ans. 

Use the built-in sort() method to sort an array of integers in JavaScript.

  • Use the sort() method with a compare function to sort the array in ascending order.

  • For descending order, modify the compare function to return b - a instead of a - b.

  • Example: const numbers = [4, 2, 5, 1, 3]; numbers.sort((a, b) => a - b);

Ernst & Young React Developer Interview Experiences

1 interview found

I appeared for an interview in Sep 2021.

Round 1 - Video Call 

(7 Questions)

Round duration - 60 Minutes
Round difficulty - Medium

This was a preety intense round revolving mainly around the core concepts of JavaScript . I was confident about my
skills in JavaScript as I already had some projects in JS and I also completed the Guided Path of JS in CodeStudio
which boosted my preparation and helped me crack these Frontend Interviews.

  • Q1. What are callbacks in JavaScript?
  • Q2. Can you explain hoisting in JavaScript?
  • Q3. What are closures in JavaScript?
  • Q4. What is the difference between slice and splice in JavaScript?
  • Ans. 

    slice() returns a shallow copy of a portion of an array without modifying the original array, while splice() changes the contents of an array by removing or replacing existing elements.

    • slice() does not modify the original array, while splice() does

    • slice() returns a new array, while splice() returns the removed elements

    • slice() takes start and end index as arguments, while splice() takes start index, number of elements t...

  • Answered by AI
  • Q5. What is a first-class function in JavaScript?
  • Ans. 

    A first-class function in JavaScript is a function that can be treated like any other variable.

    • Can be passed as an argument to other functions

    • Can be returned from other functions

    • Can be assigned to variables

    • Can be stored in data structures

  • Answered by AI
  • Q6. How would you sort an array of integers in JavaScript?
  • Ans. 

    Use the built-in sort() method to sort an array of integers in JavaScript.

    • Use the sort() method with a compare function to sort the array in ascending order.

    • For descending order, modify the compare function to return b - a instead of a - b.

    • Example: const numbers = [4, 2, 5, 1, 3]; numbers.sort((a, b) => a - b);

  • Answered by AI
  • Q7. 

    Covid Vaccination Distribution Problem

    As the Government ramps up vaccination drives to combat the second wave of Covid-19, you are tasked with helping plan an effective vaccination schedule. Your goal is...

Round 2 - Video Call 

(10 Questions)

Round duration - 60 Minutes
Round difficulty - Medium

In this round, I was asked questions from React and Redux. Since I already had prior experience in working with React
and Redux , I answered most of the questions correctly and was preety much confident about passing this round.

  • Q1. What are the differences between a class component and a functional component in ReactJS?
  • Q2. What are the differences between stateless and stateful components in ReactJS?
  • Q3. What is the diffing algorithm in ReactJS?
  • Q4. What is reconciliation in ReactJS?
  • Q5. What are props in React?
  • Q6. What are the advantages of using Redux?
  • Ans. 

    Redux helps manage application state in a predictable way.

    • Centralized state management

    • Predictable state changes with actions and reducers

    • Time-travel debugging with Redux DevTools

    • Ecosystem of middleware for additional functionality

  • Answered by AI
  • Q7. What are the key differences between mapStateToProps() and mapDispatchToProps() in Redux?
  • Ans. 

    mapStateToProps() is used to access the Redux state in a component, while mapDispatchToProps() is used to dispatch actions to update the state.

    • mapStateToProps() is used to access the Redux state and return data as props for a component.

    • mapDispatchToProps() is used to dispatch actions to update the Redux state.

    • mapStateToProps() is a function that takes the current state as an argument and returns an object with props th...

  • Answered by AI
  • Q8. What is the Combine Reducer in Redux?
  • Q9. How is Relay different from Redux?
  • Q10. How can we structure the top-level directories in Redux?
Round 3 - HR 

(2 Questions)

Round duration - 30 Minutes
Round difficulty - Easy

This was a Technical Cum HR round where I was first asked some basic principles around Frontend Web Development
and then we discussed about my expectations from the company , learnings and growth in the forthcomig years. I would
suggest be honest and try to communicate your thoughts properly in these type of rounds to maximise your chances of
getting selected.

  • Q1. What do you know about the company?
  • Q2. Why should we hire you?

Interview Preparation Tips

Eligibility criteriaAbove 7 CGPAErnst & Young (EY) interview preparation:Topics to prepare for the interview - HTML, CSS, ReactJS , JavaScript, Redux, OOPSTime required to prepare for the interview - 4 MonthsInterview preparation tips for other job seekers

Tip 1 : Do at-least 2 good projects and you must know every bit of them.
Tip 2 : Understand the fundamentals of JavaScript as they are asked very often.

Application resume tips for other job seekers

Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.

Final outcome of the interviewSelected

Skills evaluated in this interview

Interview questions from similar companies

I applied via Recruitment Consulltant and was interviewed before Jan 2021. 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 - Coding Test 

Python coding test

Interview Preparation Tips

Topics to prepare for Deloitte Software Developer interview:
  • Python
Interview preparation tips for other job seekers - always practice coding
ex: python, java etc

I applied via Naukri.com and was interviewed in Apr 2020. There was 1 interview round.

Interview Questionnaire 

2 Questions

  • Q1. What synchronous and asynchronous means??
  • Q2. When to use CTE and temp table.

Interview Preparation Tips

Interview preparation tips for other job seekers - Understand question first and answer.

I applied via Campus Placement and was interviewed before Nov 2020. There was 1 interview round.

Interview Questionnaire 

4 Questions

  • Q1. SQL Queries
  • Q2. OOPS Concepts
  • Q3. Program to calculate factorial
  • Q4. Projects- Major , Minor , Internship

Interview Preparation Tips

Interview preparation tips for other job seekers - Be confident, should have good communication skills.

Skills evaluated in this interview

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

(1 Question)

  • Q1. Explain your backgroun
  • Ans. 

    I have a strong background in software development, focusing on full-stack technologies and agile methodologies.

    • Bachelor's degree in Computer Science from XYZ University.

    • 3 years of experience in web development using JavaScript, React, and Node.js.

    • Worked on a team project that improved application performance by 30%.

    • Experience with Agile methodologies, participating in daily stand-ups and sprint planning.

    • Contributed to...

  • Answered by AI
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-

I applied via Campus Placement

Round 1 - Technical 

(1 Question)

  • Q1. Questions based on Java , C++ , OOPs, cloud computing, one coding question, regarding previous projects, some behavioural questions.

I appeared for an interview in Jan 2021.

Round 1 - HR 

(1 Question)

Round duration - 90 Minutes
Round difficulty - Medium

This round happened on the same day as JAM in the afternoon time. A slot of 20 minutes with respective timing was already sent to the selected students. Interview can’t be generalize as anything can happen over there and hence this was exclusively my experience. 
To have a quick judgement about the person, I believe nothing is better than throwing before him/her some puzzles (mathematical/ analytical/ programming problems) and see the approach. I received back-to-back 4 problems after a quick and brief introduction. The coding problems I got were way too easy (just basics: searching & mathematical). The harder part of this round was the puzzles (tricky, mathematical, related to probability). At last, I was asked a question on DBMS and the interviewer asked if I know JAVA.

  • Q1. 

    Search an Element in a Sorted Array

    Given a sorted array 'A' of 'N' integers, determine whether a number 'X' exists within this array for a series of queries. For each query, print 1 if 'X' exists in the ...

Interview Preparation Tips

Eligibility criteriaNo criteriaDeloitte interview preparation:Topics to prepare for the interview - Data Structures, C++, OOPS, System Design, Algorithms, Dynamic ProgrammingTime required to prepare for the interview - 12 MonthsInterview preparation tips for other job seekers

Tip 1 : Mention some good projects on your resume.
Tip 2 : Practice competitive and aptitude questions.
Tip 3 : Work on your communication skills.

Application resume tips for other job seekers

Tip 1 : Mention some good projects on your resume.
Tip 2 : Don't put false things on your resume.

Final outcome of the interviewSelected

Skills evaluated in this interview

Interview Questionnaire 

1 Question

  • Q1. Scenario based question on Relationship, Role, OWD,
Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - hirevue 

(2 Questions)

  • Q1. On demand video assessment that include questions to answer.
  • Q2. Games designed to test different ability.
Interview experience
3
Average
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
Selected Selected

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

Round 1 - Technical 

(1 Question)

  • Q1. Basics of java and angular
Round 2 - HR 

(1 Question)

  • Q1. Director round with typical hr questions

Interview Preparation Tips

Interview preparation tips for other job seekers - Prepare well in angular

Ernst & Young Interview FAQs

How to prepare for Ernst & Young React 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 Ernst & Young. The most common topics and skills that interviewers at Ernst & Young expect are Consulting, Analytical Chemistry, Application Development, Auditing and Business Communication.

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