Simpragma Solutions Java Full Stack Developer Interview Questions and Answers

Q1. The initial screening Round was done
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Q2. Expectations, CTC, job role
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Q1. Questions fired from java spring and react
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Q2. Answered all and cleared the interview
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Q1. It was mainly java, interviewers are very good and supportive to elaborate more about problem.
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Q2. Scenario based on your earlier work experience
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Q1. Angular : directive, lifecycle,shared component, service, dependency injection,
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Q2. Event-loop, single threaded, stream, async quque, cluster, type of api, control function, exit code, event-emitter, nextTrick, callback queue, thread pool, buffer, callback, setImmediate,middleware, async ...read more
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Q1. Basic level react questions
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Q1. Some react coding and some basic level react questions
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Q1. Longest common substring in an array
Ans. 
Find the longest common substring in an array of strings.
• Iterate through each string in the array and compare with all other strings to find common substrings.

• Keep track of the longest common substring found so far.

• Return the longest common substring at the end.
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Q1. Explain Virtual DOM in React
Ans. 
Virtual DOM in React is a lightweight copy of the actual DOM, used for efficient updates and rendering.
• Virtual DOM is a concept where a lightweight copy of the actual DOM is created in memory.

• When changes are made to the UI, React compares the Virtual DOM with the actual DOM to identify the differences.

• React then updates only the necessary parts of the actual DOM, minimizing the number of DOM manipulations for better p...read more
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Q2. How to optimise a React application
Ans. 
Optimising a React application involves code splitting, lazy loading, using memoization, reducing unnecessary re-renders, and optimizing network requests.
• Implement code splitting to load only necessary code for each route or component.

• Use lazy loading to load components only when they are needed, reducing initial load time.

• Utilize memoization techniques like useMemo and useCallback to prevent unnecessary re-renders.

• Avo...read more
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Q1. Tell me about your self?
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Q2. What is oops in javascript?
Ans. 
Object-oriented programming concepts in JavaScript.
• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Objects can inherit properties and methods from other objects.

• Polymorphism: Objects can share the same interface but have different implementations.
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Q3. What is props in react js?
Ans. 
Props in React JS are read-only properties that are passed from parent components to child components.
• Props allow you to pass data from a parent component to a child component.

• Props are immutable and cannot be changed by the child component.

• Props are accessed in the child component using this.props.

• Example: where 'name' is a prop passed from the parent component.
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Q4. Props in react js?
Ans. 
Props in React JS are used to pass data from parent components to child components.
• Props are read-only and cannot be modified by the child component.

• Props are passed down the component tree using custom attributes.

• Props help in creating reusable components by passing dynamic data.

• Example:
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Round duration - 90 minutes
Round difficulty - Medium

Q1. Find All Subsets
You are given an array ‘arr’ of ‘N’ distinct integers. Your task is to find all the non-empty subsets of the array.
Note: You can return the subsets in any order, you don’t have to speci...read more
Ans. Power Set Using Bit-Masking
 
One of the standard and useful method of finding the power set is through bit-masking.
Consider a number with N-bits in its binary representation, if we consider that the state of i^th bit depicts whether the i^th array element is included in the current subset or not, then we can uniquely identify one of the subsets (as each number has a different binary representation).
Now we can simply ...read more
Answered by CodingNinjas
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Round duration - 60 Minutes
Round difficulty - Medium

The technical question was mainly based on my resume, followed by coding questions.

Q1. Technical Questions
When do you prefer to use Bokeh and when would you prefer Matplotlib?
Explain the machine learning project on your resume?
She gave a situation, and asked what would I implement Supervised...read more
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Round duration - 30 Minutes
Round difficulty - Easy

It was a coding round

Q1. Reverse Linked List
Given a singly linked list of integers. Your task is to return the head of the reversed linked list.
For example:
The given linked list is 1 -> 2 -> 3 -> 4-> NULL. Then th...read more
Ans. Brute Force
The brute force approach is to use recursion. First, we reach the end of the Linked List recursively and at last node, we return the last node, which becomes the new head of the partially reversed Linked List. While coming back from each recursion call we add the current node in the current recursion call to the last node of the partially reversed Linked List and assign the current node to null.
 
Steps:
&...read more
Answered by CodingNinjas
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Round duration - 20 Minutes
Round difficulty - Easy

Q1. Basic HR Questions
What are you hobbies?
What are your salary expectations?
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General not technical

Coding questions and scenerio based questions

Q1. Technical interview with Java Spring boot and SQL
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Q2. Implement custom array listin java

Ans. 

Custom implementation of ArrayList in Java

• Create a class with an array to store elements

• Implement methods like add, get, remove, size, etc.

• Handle resizing of the array when needed

• Example: CustomArrayList list = new CustomArrayList<>();

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