HDFC Securities Senior Front End Engineer Interview Questions and Answers

Q1. Explained about micro front end in react js
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Q1. Reason for job change
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Q2. Can i Work from office for 15 days each month?
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30min and ask one coding question

30min and ask 2 coding question

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Q1. Can you explain the difference between a stack and a queue and provide a real-world example where each would be used.
Ans. 
A stack is a Last In First Out (LIFO) data structure, while a queue is a First In First Out (FIFO) data structure.
• Stack: LIFO - Last In First Out. Example: browser history where the last page visited is the first to be accessed.

• Queue: FIFO - First In First Out. Example: a line at a grocery store where the first person in line is the first to be served.
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Q2. Given an array of integers, write a function to find the two numbers that add up to a specific target. How would you optimize this solution?
Ans. 
Function to find two numbers in array that add up to target. Optimize solution.
• Use a hash map to store each number and its index as you iterate through the array.

• For each number, check if the difference between the target and the number exists in the hash map.

• Return the indices of the two numbers that add up to the target.
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Q1. What is node js?
Ans. 
Node.js is a runtime environment that allows you to run JavaScript code outside of a web browser.
• Node.js is built on Chrome's V8 JavaScript engine.

• It uses an event-driven, non-blocking I/O model.

• Node.js is commonly used for building server-side applications.

• It has a large ecosystem of open-source libraries and frameworks like Express.js.
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Q2. What is event loop?
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Event loop is a mechanism that allows a program to efficiently handle multiple events or tasks concurrently.
• Event loop is commonly used in asynchronous programming to manage tasks that may take varying amounts of time to complete.

• It continuously checks for events or tasks in a queue and executes them one by one.

• Event loop helps prevent blocking of the main thread by allowing non-blocking execution of tasks.

• Popular exam...read more
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Q3. Difference between callback and promise?
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Callback is a function passed as an argument to another function to be executed later, while a promise is an object representing the eventual completion or failure of an asynchronous operation.
• Callback is used in traditional asynchronous programming, while promises are used in modern asynchronous programming.

• Callbacks can lead to callback hell or pyramid of doom, while promises provide better readability and error hand...read more
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Q4. What is middlewares in node js?
Ans. 
Middlewares in Node.js are functions that have access to the request and response objects, and can modify or terminate the request-response cycle.
• Middlewares are functions that are executed in the middle of the request-response cycle.

• They can perform tasks like parsing request data, logging, authentication, etc.

• Middlewares can be added using app.use() method in Express framework.

• Example: app.use(bodyParser.json()) to p
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Q5. What is event emitter?
Ans. 
Event emitter is a pattern used to handle and respond to events in software development.
• Event emitter is a design pattern commonly used in Node.js for handling events.

• It allows objects to subscribe to events and be notified when those events occur.

• Event emitter is often used for asynchronous programming and decoupling components.

• Example: EventEmitter class in Node.js can be used to create custom events and handle them.
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Q1. Unique Paths (2d-dp)
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Q2. Flip any rows or columns at any time to make the sum of gird cells ofa provided square in a matrix should be minimum
Ans. 
To minimize the sum of grid cells in a square matrix, flip rows or columns as needed.
• Identify the rows or columns with the highest values and consider flipping them to reduce the sum

• Try different combinations of flipping rows and columns to find the minimum sum

• Consider using dynamic programming or backtracking to efficiently explore all possible combinations
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Easy general questions

Easy array questions

Q1. Mid leetcode question based on role
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Q1. General questions
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Q1. Observables vs promises Lifecycle hooks Pipes
Ans. 
Observables are used for handling asynchronous operations in a stream-like manner, promises are for handling a single async operation, and lifecycle hooks are methods that allow you to tap into the lifecycle of a component in Angular.
• Observables are used in Angular for handling asynchronous operations in a stream-like manner, allowing you to work with data over time.

• Promises are used for handling a single asynchronous ...read more
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Q1. Lazy loading Dependency injection
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