People Tech Group Front end Developer Interview Questions and Answers

1 hr -duration and Question is Full of basics and technology what we have used

Q1. ES6 concepts, React js over all concepts
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Q1. ES6 concepts, coding
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Q1. Challenges, about current project
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Q1. General questions and joining formalities
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Q1. Basic JS & React JS question
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Q1. Advance level of JS and React related question and coding skills test as well.
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Q1. What are your salary expectations?
Ans. 
I am open to discussing salary based on the responsibilities and requirements of the position.
• I am flexible and open to negotiation.

• I am looking for a fair and competitive salary.

• I am more interested in the overall compensation package rather than a specific number.

• I would like to be compensated based on my skills, experience, and the value I can bring to the company.
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Q1. Clousers in Javascript
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Closures are functions that have access to variables in their outer scope, even after the outer function has returned.
• Closures are created when a function is defined inside another function.

• The inner function has access to the outer function's variables and parameters.

• Closures can be used to create private variables and methods.

• Closures can also be used to create functions with pre-set arguments.
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Q2. Difference between use ref and create ref
Ans. 
useRef is a hook used to create a mutable ref object, while createRef is a method used to create a ref object.
• useRef is a hook provided by React, while createRef is a method provided by the React library.

• useRef can be used in functional components to create a mutable ref object that persists across renders.

• createRef is used in class components to create a ref object that can be attached to a DOM element.

• useRef can also...read more
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Topics covered DSA and Javascript

Q1. Display a list of items using Pagination concept in React using any online coding editor.
Ans. 
Display a list of items using Pagination concept in React
• Create a list of items to display

• Implement pagination logic to display a limited number of items per page

• Add navigation buttons to switch between pages
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Q2. Check if pair sum exists in the array (Two Sum)?
Ans. 
Check if pair sum exists in the array using a hash map.
• Use a hash map to store the difference between the target sum and each element in the array.

• Iterate through the array and check if the current element exists in the hash map.

• Return true if a pair sum exists, otherwise return false.
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Q3. React LifeCycle?
Ans. 
React lifecycle methods manage component behavior during its existence, from creation to removal.
• Mounting: Methods like constructor(), render(), and componentDidMount() are called when a component is being created.

• Updating: Methods like shouldComponentUpdate(), render(), and componentDidUpdate() are invoked when a component's state or props change.

• Unmounting: The componentWillUnmount() method is called just before a co...read more
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Q4. How do you improve the performance of a website?
Ans. 
Improving website performance involves optimizing code, reducing server requests, using caching, and optimizing images.
• Optimize code by minifying CSS, JavaScript, and HTML

• Reduce server requests by combining files and using asynchronous loading

• Utilize caching techniques like browser caching and server-side caching

• Optimize images by resizing, compressing, and using modern image formats like WebP
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Q5. What is NextJS?
Ans. 
NextJS is a React framework that allows for server-side rendering and static site generation.
• NextJS is built on top of React, providing features like server-side rendering and static site generation.

• It simplifies the process of building React applications by handling routing, code splitting, and more out of the box.

• NextJS also supports API routes for serverless functions and data fetching.

• It offers features like automa...read more
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Q1. What is bridge? What is the new architecture?
Ans. 
Bridge is a structural design pattern that decouples an abstraction from its implementation. The new architecture refers to modern design patterns and technologies used in software development.
• Bridge pattern allows the client code to work with different implementations of an interface independently.

• The new architecture in front end development may include concepts like component-based architecture, state management lib...read more
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Q2. How will you optimize a react native app
Ans. 
Optimizing a React Native app involves reducing bundle size, improving performance, and enhancing user experience.
• Use code splitting to reduce initial load time

• Optimize images and assets for smaller file sizes

• Implement lazy loading for components that are not immediately visible

• Minimize the use of third-party libraries and only include necessary dependencies

• Utilize performance monitoring tools like React Native Perform...read more
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Q3. What is context API
Ans. 
Context API is a feature in React that allows sharing data between components without having to pass props through every level of the component tree.
• Context API provides a way to pass data through the component tree without having to pass props down manually at every level.

• It is useful for sharing global data such as themes, user authentication, or language preferences.

• Context API consists of three main parts: Provider...read more
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Q4. What is hoisting
Ans. 
Hoisting is a JavaScript mechanism where variable and function declarations are moved to the top of their containing scope during compilation.
• Variable declarations are hoisted to the top of their scope, but not their initializations.

• Function declarations are fully hoisted, including their definitions.

• Hoisting can lead to unexpected behavior if not understood properly.
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Create 1 webpage using html, css, js, scss - xd provided

Q1. Doctype in html
Ans. 
Doctype in HTML specifies the version of HTML being used in the document.
• Doctype declaration is placed at the very beginning of an HTML document before the <html> tag.

• It helps the browser to render the web page correctly by specifying the version of HTML being used.

• Example: <!DOCTYPE html> for HTML5, <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-tr...read more
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Q2. What is Flexbox in css
Ans. 
Flexbox is a layout model in CSS that allows you to design complex layouts with a more efficient and predictable way.
• Flexbox is used for creating flexible and responsive layouts.

• It allows you to align and distribute space among items in a container.

• Flexbox properties include display: flex, flex-direction, justify-content, align-items, and more.

• Example: display: flex; justify-content: center; align-items: center;
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Q3. Document.ready and window.onload difference
Ans. 
Document.ready is a jQuery function that fires when the DOM is ready, while window.onload is a vanilla JavaScript event that fires when all resources have loaded.
• Document.ready is specific to jQuery, while window.onload is a standard JavaScript event.

• Document.ready fires when the DOM is ready, even if images are still loading, while window.onload waits for all resources to finish loading.

• Document.ready is faster than w...read more
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Q4. Position properties in css
Ans. 
Position properties in CSS control the positioning of elements on a webpage.
• The 'position' property specifies the type of positioning method used for an element (static, relative, absolute, fixed, or sticky).

• The 'top', 'right', 'bottom', and 'left' properties can be used to adjust the position of an element relative to its containing element.

• Examples: position: relative; top: 10px; left: 20px;
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Q5. Box model in css
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Box model in CSS refers to the way elements are rendered on a webpage, including content, padding, border, and margin.
• The box model consists of content, padding, border, and margin.

• Content is the actual content of the element.

• Padding is the space between the content and the border.

• Border is the line that surrounds the padding.

• Margin is the space outside the border.

• You can adjust the size of each part of the box model u...read more
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Q6. Semantic tags in html
Ans. 
Semantic tags in HTML are specific tags that provide meaning to the content they enclose.
• Semantic tags help search engines and screen readers understand the structure of a webpage.

• Examples of semantic tags include <header>, <footer>, <nav>, <article>, <section>, <aside>, <main>, <figure>, <figcaption>.

• Using semantic tags improves SEO and accessibility of a website.
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Q7. Display properties
Ans. 
Display properties are used in CSS to control the layout and appearance of elements on a webpage.
• Display property determines how an element is displayed on the page

• Common values include 'block', 'inline', 'inline-block', 'flex', 'grid', 'none'

• Example: display: block; will make the element a block-level element
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Q1. What is Flexbox in css
Ans. 
Flexbox is a layout model in CSS that allows for the design of complex responsive layouts with a more efficient and predictable way.
• Flexbox is used to create flexible and responsive layouts.

• It allows for easy alignment and distribution of space among items in a container.

• Flexbox properties include display: flex, flex-direction, justify-content, align-items, and more.

• Example: display: flex; justify-content: center; alig...read more
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Q2. Box sizing difference and scenario
Ans. 
Box sizing property in CSS determines how the total width and height of an element is calculated.
• Content-box: width and height only include the content, padding and border are added on top.

• Border-box: width and height include content, padding, and border.

• Use content-box when you want to specify the width and height of the content area only.

• Use border-box when you want to specify the width and height of the entire box i...read more
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Q3. Bootstrap grid and flex
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