Hewlett Packard Enterprise Front end Developer Interview Questions and Answers

Q1. Basics of react and JavaScript
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Q1. Reverse the string
Ans. 
Reverse a given string
• Use built-in methods like split(), reverse(), and join() to reverse the string

• Alternatively, loop through the string from end to start and build a new reversed string
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Q1. How to handle state in functional components.
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State in functional components can be managed using the useState hook in React.
• Use the useState hook to declare state variables in functional components.

• useState returns an array with the current state value and a function to update that value.

• Example: const [count, setCount] = useState(0);

• State variables should be immutable, so always use the setter function to update them.
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Q2. What is event loop in javascript.
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Event loop in JavaScript is responsible for handling asynchronous operations by executing callback functions in a non-blocking way.
• Event loop is a mechanism that allows JavaScript to perform non-blocking operations.

• It continuously checks the call stack and the callback queue to see if there are any functions that need to be executed.

• If the call stack is empty, it takes the first function from the callback queue and pus...read more
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Q3. What is hosting in Javascript
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Hosting in JavaScript refers to the process of declaring a variable or function before it is used in the code.
• Hosting allows you to use variables and functions before they are declared in the code.

• Variables are hoisted to the top of their scope, while functions are fully hoisted.

• Example: console.log(myVar); var myVar = 10; This will not throw an error because 'myVar' is hoisted to the top of the scope.
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90 minutes 3 coding questions

Q1. Wall the topics rite a code using of OOPS
Ans. 
Object-oriented programming (OOP) is a programming paradigm based on the concept of objects, which can contain data and code.
• Create classes to represent real-world entities

• Encapsulate data and behavior within classes

• Use inheritance to create relationships between classes

• Implement polymorphism to allow objects to be treated as instances of their parent class
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Q2. Polymorphism code using all the properties
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Polymorphism allows objects of different classes to be treated as objects of a common superclass.
• Polymorphism is achieved through method overriding in subclasses.

• It allows for more flexibility and reusability in code.

• Example: Animal superclass with subclasses Dog and Cat, both overriding the makeSound() method.
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Q3. Inheritance and its types
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Inheritance is a mechanism in object-oriented programming where a class inherits properties and behaviors from another class.
• Types of inheritance include single inheritance, where a class inherits from only one parent class

• Multiple inheritance, where a class inherits from multiple parent classes (not supported in some languages)

• Multilevel inheritance, where a class inherits from a class that itself inherits from anothe...read more
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Q1. Tell me about yourself
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Q2. Basic hr questions only
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Q1. What is mean by dom
Ans. 
DOM stands for Document Object Model, which is a programming interface for web documents.
• DOM is a representation of the structure of a web page, allowing scripts to dynamically access and update the content, structure, and style of the document.

• It provides a way for scripts to interact with the web page by accessing and manipulating elements like text, images, forms, etc.

• DOM is platform and language-independent, allowi...read more
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Q2. Explain promise in typescript
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Promises in TypeScript are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in a more readable and manageable way.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and .catch() to handle errors.

• Example: const myPromise = new Promise((resolve, reject) => { ...
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Q3. Explain hooks in javascript
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Hooks in JavaScript are functions that let you use state and other React features without writing a class.
• Hooks were introduced in React 16.8 to allow functional components to have state and lifecycle methods.

• useState() is a hook that allows you to add state to functional components.

• useEffect() is a hook that allows you to perform side effects in functional components.

• Custom hooks are functions that allow you to reuse
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Q4. Write a program 1 to 100 prime numbers
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Generate an array of prime numbers from 1 to 100.
• Iterate from 1 to 100 and check if each number is prime

• A prime number is only divisible by 1 and itself

• Start with a list of prime numbers and check divisibility
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