Dayal Group Lead Software Engineer Interview Questions and Answers

The first round was an online assesment conducted on the hackerrank platform. This round
consisted of 3 DSA Question, 2 Medium and 1 Hard. The duration of the test was 1hr
45mins.

Q1. The question was really long, but it was essentially asking us to design a polling system with two actors (CLI only): the user and the administrator. The admin's tasks were to create a poll, delete a pol...read more
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Q1. He asked me about the box model in CSS. He expected me to remember some basic Bootstrap and Tailwind classes, as well as the Bootstrap grid system. He was happy with the number of projects I had made and...read more
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Q1. SQL Array Oop
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Q2. Array defintiion and uses
Ans. 
An array is a data structure that stores a collection of elements of the same data type.
• Arrays are used to store multiple values in a single variable.

• Elements in an array are accessed by their index, starting from 0.

• Example: String[] names = {"Alice", "Bob", "Charlie"};
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Q3. Data structures and its uses
Ans. 
Data structures are used to organize and store data efficiently in computer memory.
• Data structures help in efficient data retrieval, insertion, and deletion operations.

• Examples include arrays, linked lists, stacks, queues, trees, and graphs.

• Each data structure has its own advantages and use cases based on the requirements of the application.

• For example, arrays are used for random access to elements, while linked lists
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Q1. List, tuple Decorators
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Q2. What is the process for removing duplicates from a list?
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Q1. What is the difference between normal and arrow functions
Ans. 
Arrow functions are more concise and have a lexical 'this' binding compared to normal functions.
• Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.

• Arrow functions do not have their own 'arguments' object.

• Arrow functions cannot be used as constructors with 'new'.

• Arrow functions are more concise and have implicit return when no curly braces are used.
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Q2. All basic JS Questions to cover Hoisting closure
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Q3. They asked to show me an example using the API call
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Q4. Difference between forEach and Map
Ans. 
forEach is used to iterate over an array and perform a function on each element, while map creates a new array by applying a function to each element.
• forEach does not return a new array, while map does

• forEach does not modify the original array, while map creates a new array

• forEach is used for side effects, while map is used for transformation

• Example: forEach - array.forEach(item => console.log(item)), map - const newAr
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Q1. What is Observables, Services, Promises, Closure ?
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Q1. Given an array of n numbers , find the kth largest find the sum from a th largest to bth largest n can be huge
Ans. 
Find the sum of kth to bth largest numbers in a huge array efficiently.
• Sort the array in descending order to easily find the kth and bth largest numbers.

• Use a priority queue or min heap to efficiently find the kth and bth largest numbers without sorting the entire array.

• Once you have the kth and bth largest numbers, iterate through the array and sum the numbers between them.
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Q2. Mostly elasticsearch related and company work related questions
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Q1. Union and union all difference
Ans. 
UNION combines the results of two or more SELECT statements, while UNION ALL includes duplicates.
• UNION removes duplicate rows, while UNION ALL retains all rows including duplicates

• UNION is slower than UNION ALL as it performs a distinct operation

• UNION requires the same number of columns in the SELECT statements, while UNION ALL does not have this restriction
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Q2. What is generic and non-generic collections

Ans. 

Generic collections allow storing any type of data, while non-generic collections are type-specific.

• Generic collections can store any type of data, such as List or Dictionary.

• Non-generic collections are type-specific, like ArrayList or HashTable.

• Generic collections provide type safety and better performance compared to non-generic collections.

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