Html,css,javascript,reactjs,php,laravel.bootstrap

Q1. Why we use reactjs? and javascript
Ans. 
ReactJS is used for building interactive user interfaces, while JavaScript is the programming language that powers web development.
• ReactJS allows for component-based architecture, making it easier to manage and update UI elements.

• ReactJS uses a virtual DOM for efficient rendering, improving performance.

• JavaScript is the language used to add interactivity and dynamic behavior to web pages.

• JavaScript is essential for cli...read more
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Q2. This is use fro single page web aplication or real time.
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Q1. 1. What is redux? 2. What are useRefs
Ans. 
Redux is a predictable state container for JavaScript apps. useRef is a hook in React for accessing DOM nodes.
• Redux is a state management library for JavaScript applications

• It helps in managing the state of an application in a predictable way

• Redux follows a unidirectional data flow pattern

• useRef is a hook in React that allows accessing DOM nodes or any other mutable value

• It returns a mutable ref object that persists ac
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Q2. What is destructuring
Ans. 
Destructuring is a way to extract values from arrays or objects and assign them to variables.
• Destructuring can be used with arrays and objects

• It allows you to extract values and assign them to variables in a single line of code

• You can also use default values and rename variables during destructuring

• Example: const [a, b] = [1, 2]; // a = 1, b = 2

• Example: const {name, age: years} = {name: 'John', age: 30}; // name = 'Joh
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Q1. What is store in react
Ans. 
Store in React is a centralized state management system.
• Store holds the state of the application.

• It allows components to access and update the state.

• Redux is a popular store implementation for React.

• Context API is another built-in store in React.

• Store helps in managing complex state and makes debugging easier.
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Q1. Css flexbox and grid
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Q2. Pagination on scroll
Ans. 
Implementing pagination on scroll allows for loading more content as the user reaches the bottom of the page.
• Use a scroll event listener to detect when the user has reached the bottom of the page

• Make an API call to fetch more data when the bottom is reached

• Append the new data to the existing content on the page
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Q3. Immediately invoked fn and anonymous fn
Ans. 
Immediately invoked function expressions (IIFE) are functions that are executed immediately after they are created.
• IIFE is defined and invoked at the same time using parentheses at the end of the function declaration.

• Anonymous functions do not have a name and can be used as IIFE by wrapping them in parentheses.

• IIFE is commonly used to create a private scope for variables and functions.
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Q4. What are closures
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Closures are functions that have access to variables from their outer scope even after the outer function has finished executing.
• Closures allow functions to access variables from their parent function even after the parent function has returned

• They help in creating private variables and functions in JavaScript

• Closures are commonly used in event handlers and callbacks
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Q5. What is promise? explain
Ans. 
A promise is an object representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

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

• Promises can be chained using .then() method to handle success and failure callbacks.

• Example: Fetch API returns a promise when making an HTTP request.
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Q6. What is lazy loading -explain
Ans. 
Lazy loading is a technique used in web development to defer loading non-essential resources until they are needed.
• Lazy loading helps improve page load times by only loading resources when they are required.

• It is commonly used for images, videos, and other media files on a webpage.

• Lazy loading can be implemented using JavaScript libraries like Intersection Observer or by using native browser features like loading='lazy
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Q7. Media query and css selectors
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Q1. Brief introduction of yourself.
Ans. 
Experienced HTML developer with a passion for creating user-friendly websites.
• Over 5 years of experience in HTML development

• Proficient in CSS and JavaScript

• Strong understanding of responsive design principles

• Familiar with SEO best practices

• Portfolio includes websites for various clients and industries
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Q2. What is HTML give a proper explanation
Ans. 
HTML stands for HyperText Markup Language, used for creating and structuring web pages.
• HTML is the standard markup language for creating web pages

• It uses tags to define the structure and content of a web page

• Examples of HTML tags include , ,
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Q1. Explanation of CSS.
Ans. 
CSS is a styling language used to control the look and feel of a website.
• CSS stands for Cascading Style Sheets.

• It is used to define styles for web pages, including colors, fonts, layout, and more.

• CSS can be applied to HTML elements using selectors.

• It allows for the separation of content from presentation, making it easier to maintain and update.

• CSS can be included in an HTML document using the
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Q2. Explanation of bootstrap.
Ans. 
Bootstrap is a front-end framework for developing responsive and mobile-first websites.
• Bootstrap is a free and open-source CSS framework.

• It includes pre-built design templates and components like buttons, forms, and navigation bars.

• Bootstrap uses a 12-column grid system for easy layout customization.

• It also has built-in responsive utilities for creating mobile-friendly designs.

• Bootstrap can be customized using Sass var
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Q1. Codes of HTML and made a program
Ans. 
HTML codes are used to create web pages. Developers write HTML codes to structure content on a webpage.
• HTML tags are used to define the structure of a webpage, such as headings, paragraphs, images, links, etc.

• Example:

  This is a heading

  ,

  This is a paragraph

  ,

• HTML attributes provide additional information about an element, such as the source of an image or the target of a link.

• Example: Ans. 

  CSS is a styling language used to design the layout and appearance of web pages, while landing pages are web pages designed for a specific purpose.

  • CSS stands for Cascading Style Sheets and is used to control the visual presentation of HTML elements on a web page.

  • CSS allows developers to style elements such as fonts, colors, spacing, and layout.

  • Landing pages are web pages specifically designed to achieve a particular go...read more

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Coding a frontend UI from provided image. And creating a fucntional star rating system

Q1. Designing a Component API in React using Typescript.
Ans. 
Designing a Component API in React using Typescript involves defining props, state, and methods for the component.
• Define the props interface to specify the expected input data for the component

• Use typescript types to ensure type safety and prevent runtime errors

• Define the state interface to manage the internal state of the component

• Implement methods to handle user interactions and component logic

• Document the component
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Q2. Create a function that can clear all the timer ids at once.
Ans. 
Function to clear all timer ids at once
• Create an array to store all timer ids

• Iterate through the array and clear each timer id using clearTimeout() function
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Q1. Introduction life cycle looks pipe @input @output
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Q1. What is event bubbling
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Q2. What is TDD and why TDD
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It was a hacker coding test mostly javascript questions

Q1. React advance concept
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Q2. Context api how to use that
Ans. 
Context API is a feature in React that allows sharing data between components without having to pass props manually.
• Create a context using createContext() method

• Use the Provider component to wrap the components that need access to the context

• Access the context data using the useContext() hook within the consuming components
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Q3. Higher order component
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Q1. Mainly introduction, how do you manage a project
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Q2. How to debug a code
Ans. 
Debugging a code involves identifying and fixing errors in the code to ensure it runs correctly.
• Use console.log() statements to print out values and check for errors

• Utilize browser developer tools to inspect elements and debug JavaScript

• Step through the code using breakpoints to identify the source of the issue

• Review error messages and stack traces to pinpoint the problem

• Consider using tools like linters and debuggers
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Q3. How to get employee details using group by
Ans. 
Employee details can be retrieved using group by clause in SQL.
• Use GROUP BY clause in SQL to group employee details based on a specific column

• Aggregate functions like COUNT, SUM, AVG can be used with GROUP BY to get summarized employee details

• Example: SELECT department, COUNT(*) as total_employees FROM employees GROUP BY department
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