XL Health Senior Software Engineer Interview Questions and Answers for Experienced

They ask you open Hacker Earth site and choose some random programs and ask you to complete it.

Q1. What is multi threading
Ans. 
Multi threading is the ability of a program to perform multiple tasks concurrently.
• It allows for better utilization of CPU resources

• It can improve program performance and responsiveness

• Examples include web servers handling multiple requests simultaneously and video games rendering graphics while processing user input
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Q2. What is extend keyword
Ans. 
The extend keyword is used to add properties and methods to an existing object.
• Used in JavaScript to add properties and methods to an object

• Can be used to inherit properties and methods from a parent object

• Syntax: Object.assign(target, ...sources)

• Example: const obj1 = {a: 1}; const obj2 = {b: 2}; const obj3 = {...obj1, ...obj2};
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Q3. Explain override. Why we need virtual?
Ans. 
Override is used to provide a new implementation of a method in a subclass. Virtual is needed to allow the method to be overridden.
• Override is used to change the behavior of a method in a subclass

• Virtual is used to allow the method to be overridden in a subclass

• Without virtual, a subclass cannot override a method from its parent class

• Override is used to implement polymorphism in object-oriented programming
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Q4. Write a program to sort the array and remove duplicates.
Ans. 
Program to sort and remove duplicates from an array.
• Use built-in sort() method to sort the array in ascending order.

• Loop through the sorted array and remove duplicates using filter() method.

• Return the sorted and duplicate-free array.
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Q5. What is Is Relationship and As Relationship in oops?
Ans. 
Is Relationship and As Relationship are two types of relationships in object-oriented programming.
• Is Relationship is a type of relationship where one class is a subset of another class.

• As Relationship is a type of relationship where one class is a type of another class.

• Is Relationship is denoted by a solid line with a closed arrowhead pointing towards the superclass.

• As Relationship is denoted by a dotted line with an o...read more
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Q6. What are architectural, structural, behavioural design patterns? Why we need them?
Ans. 
Architectural, structural, and behavioral design patterns are reusable solutions to common software design problems.
• Architectural patterns define the overall structure of a software system

• Structural patterns describe how objects and classes can be combined to form larger structures

• Behavioral patterns focus on communication between objects and how they operate together

• Design patterns help to improve software quality, ma...read more
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Q1. Past work experience explanation, skill set and technical requirements
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Skill test and technical knowledge evaluation

Q1. Tell me about yourself, preferred work location and expected salary.
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Q1. Java 8 Feature?
Ans. 
Java 8 introduced lambda expressions, functional interfaces, streams, and default methods in interfaces.
• Lambda expressions allow you to pass functionality as an argument to a method.

• Functional interfaces have a single abstract method and can be used with lambda expressions.

• Streams provide a way to work with sequences of elements efficiently.

• Default methods allow interfaces to have methods with implementation.

• Example: (...read more
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Q2. Singeton Immutable Collections
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Q1. Microservices SQL
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Q1. What is flutter
Ans. 
Flutter is a UI toolkit for building natively compiled applications for mobile, web, and desktop from a single codebase.
• Developed by Google

• Uses Dart programming language

• Hot reload feature for quick development

• Supports iOS, Android, Web, and Desktop platforms

• Provides a rich set of pre-built widgets
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