Lumbini Elite Solutions & Services Software Engineer Trainee Interview Questions and Answers for Freshers

Q1. What is the difference between== and === in javascript?
Ans. 
In JavaScript, == is used for loose equality comparison, while === is used for strict equality comparison.
• == checks for equality after type coercion, while === checks for equality without type coercion

• === is more strict and recommended for use to avoid unexpected behavior

• Example: 1 == '1' will return true, but 1 === '1' will return false
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Q2. == refers to only value comparison and === refers to both data type and value comparison
Ans. 
True. == compares only values, while === compares both values and data types.
• == is used for value comparison, while === is used for both value and data type comparison

• Example: 5 == '5' will return true, but 5 === '5' will return false

• Example: 5 === 5 will return true, as both value and data type are the same
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5 technical questions were asked out of which 3 tests are to be cleared

Q1. What is NVM?
Ans. 
NVM stands for Node Version Manager, a tool used to manage multiple versions of Node.js on a single machine.
• NVM allows developers to easily switch between different versions of Node.js for different projects.

• It helps in avoiding conflicts between different projects that require different versions of Node.js.

• NVM is commonly used in development environments where different projects have different Node.js version requirem
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Q2. Node version Manager where we can handle higher node js version in a lower node js version
Ans. 
Node Version Manager (NVM) allows managing multiple Node.js versions on the same machine.
• NVM allows you to easily switch between different Node.js versions on your machine.

• It helps in handling higher Node.js versions in a lower Node.js version environment.

• You can install, uninstall, and switch between Node.js versions using NVM.

• Example: 'nvm install 12.18.3' to install a specific Node.js version.
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Give 10 questions from node js backend

Q1. Ask about angular and node js
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Q2. What is package.json
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package.json is a file used in Node.js projects to manage dependencies, scripts, and metadata.
• It is a JSON file that contains information about the project, such as name, version, dependencies, and scripts.

• It is used to manage project dependencies by listing them in the 'dependencies' and 'devDependencies' fields.

• It allows developers to define scripts for tasks like building, testing, and running the project.

• Example: {...read more
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Q3. What is components in angular,how share data to component
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Components in Angular are building blocks of an application. Data can be shared between components using input properties and output events.
• Components in Angular are reusable, self-contained units of code that define a part of the user interface.

• Data can be shared to a component using input properties, where data is passed from the parent component to the child component.

• Data can also be shared from a child component t...read more
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Q4. What is === and == ,and wher use === is real time projects
Ans. 
=== is strict equality operator, while == is loose equality operator. === is commonly used in real-time projects for accurate comparisons.
• === is a strict equality operator that checks both value and type of operands

• == is a loose equality operator that only checks the value of operands

• === is commonly used in real-time projects to ensure accurate comparisons and prevent unexpected type coercion issues
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Q5. Write arrow function syntax
Ans. 
Arrow function syntax in JavaScript
• Arrow functions are concise syntax for writing function expressions in JavaScript

• They have a shorter syntax compared to traditional function expressions

• They do not have their own 'this', 'arguments', 'super', or 'new.target' keywords
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Q6. What is difference between arrow function and anonymous function
Ans. 
Arrow functions are concise syntax for writing function expressions, while anonymous functions do not have a name.
• Arrow functions have a shorter syntax compared to anonymous functions.

• Arrow functions do not have their own 'this' keyword, while anonymous functions do.

• Arrow functions do not have 'arguments' object, while anonymous functions do.

• Arrow functions are not hoisted, while anonymous functions are hoisted.
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Q1. CLOSURE IN Javascript ?
Ans. 
Closure in JavaScript is a function that has access to its own scope, as well as the outer scope in which it was defined.
• A closure allows a function to access variables from its outer function even after the outer function has finished executing.

• Closures are commonly used in event handlers, callbacks, and in functional programming.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFun
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Q2. Class and ID difference
Ans. 
Class is used to style multiple elements, while ID is used to style a single element.
• Class can be used multiple times in a document, while ID should be unique

• Class is denoted by a period (.), ID is denoted by a hash (#)

• Class can be applied to multiple elements, ID can only be applied to one element
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Q1. System Design question
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Q2. Leetcode medium question on backtracking
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Questions on arrays and string on hacerrank easy to moderate level questions core java asked in technical interview 2 TR round and 1 MR round

Q1. Self introduction
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Q1. Explain about SQL indexing
Ans. 
SQL indexing is a technique used to improve the performance of database queries by creating indexes on columns.
• Indexes are created on columns in a database table to speed up data retrieval.

• Indexes work similar to the index of a book, allowing the database to quickly find the desired data.

• Types of indexes include clustered, non-clustered, unique, and composite indexes.

• Examples of SQL indexing include creating an index o...read more
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It was medium level aptitude . but still many of the students didn't qualify that.
qualify criteria was around 50% marks in aptitude test.
20 questions in 30 minutes

2 coding questions of medium level from leetcode
1. inplace 90 degree matrix rotation
2. longest substring

it was on a paper , not an online mode

General gd round , mainly to check communication

Q1. Oops medium data structure sql questions
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Given a pattern and we need to complete the pattern within 40mins, also allows completing this problem in any language ( c,c++, python, java).

Q1. Went through a technical interview, and was asked to solve some coding questions(4 - 5), and some technical stuff. It is one on one interview.
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Q2. Also, test our reasoning skills and explanation of an algorithm.
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Q1. Another technical round.
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Q1. This is the final phase of the recruitment
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Q2. Tell me about your family, friends, and intermediate.
Ans. 
I have a close-knit family and a supportive group of friends. I also have intermediate skills in various programming languages.
• My family is very important to me and we have a strong bond.

• I have a few close friends who have always been there for me.

• In terms of programming, I have intermediate skills in languages like Java, Python, and JavaScript.
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