Alemeno Front end Web Developer Interview Questions and Answers

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. Hoisting concept with examples and guess the output
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope.
• Variable declarations are hoisted but not their initializations.

• Function declarations are fully hoisted.

• Example: console.log(myVar); var myVar = 10; // Output: undefined

• Example: console.log(myFunc()); function myFunc() { return 'Hello!'; } // Output: Hello!
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Q2. Map functionality with a call back function
Ans. 
Using map function to apply a callback function to each element in an array
• Map function is used to iterate over an array and apply a callback function to each element

• The callback function can perform operations on each element and return a new value

• Example: arr.map(item => item * 2) will double each element in the array
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Q3. Copy object, spread operator usage . Deep copy, sallow copy
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Q4. Flexbox vs grid, dom, box model,
Ans. 
Flexbox is best for one-dimensional layouts, Grid is best for two-dimensional layouts, DOM is the structure of a webpage, Box model is the layout of elements.
• Flexbox is best for creating one-dimensional layouts like navigation bars or sidebars.

• Grid is best for creating two-dimensional layouts like grids of images or cards.

• DOM (Document Object Model) is the structure of a webpage, representing the elements as objects.

• Bo...read more
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Q5. React optimization, why React,
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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 to create and structure 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

• Example: <html><head><title>Page Title</title></head><body><h1>This is a Heading</h1><p>This is a paragraph.</p></body></html>
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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 use tags and attributes to structure content and design layouts.
• HTML tags are used to define different elements on a webpage, such as headings, paragraphs, images, and links.

• Attributes provide additional information about an element, such as its appearance or behavior.

• Example: <h1>This is a heading</h1>

• Example: <img src='image.jpg' alt='Description of i
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Q2. Explanation of CSS, landing pages
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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Explanation of HTML ,CSS and bootstrap.

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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