ValueLabs Front end Developer Interview Questions and Answers

2 coding problem of array and another of stack

Q1. What is callback hell
Ans. 
Callback hell is a situation in asynchronous programming where multiple nested callbacks make the code difficult to read and maintain.
• Callback hell occurs when there are multiple levels of nested callbacks in asynchronous code.

• It makes the code difficult to understand, debug, and maintain.

• Promises and async/await are solutions to avoid callback hell.

• Example: nested callbacks in JavaScript AJAX requests.
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Q2. What is the difference between props and state
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Props are used to pass data from a parent component to a child component, while state is used to manage data within a component.
• Props are read-only and cannot be modified by the child component

• State is mutable and can be updated using setState()

• Props are passed down from parent to child components

• State is managed within a component and can be changed based on user interactions or other events
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Q1. Based on Angular
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Q2. Based on Html, CSS, Javascript
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Basic Aptitude questions

2 coding questions on arrays

Given a trending topic going on in Internet and discussion on it

Q1. Basic technical questions and some coding questions
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Q1. Hr type questions, salary discussion other
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Q1. React js Basic Question
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Q2. Coding Question Giving API to call and show in UI
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Q1. Basic questions on JavaScript, React and HTML/CSS.
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Q2. Hoisting, Closures, Event Loop, Promises, Async/Await
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Q3. Semantic elements, block and inline elements, meta tag CSS box model, ways of adding CSS, CSS pre-processors
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Q4. React questions on component lifecycle, different hooks and thier use, fetching data and displaying it in a list.
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Q1. CSS Box-model definition
Ans. 
CSS Box-model defines how elements are rendered in a webpage, including padding, border, and margin.
• Box-model consists of content, padding, border, and margin

• Content area is where text or images are displayed

• Padding is the space between content and border

• Border is the line around the content and padding

• Margin is the space outside the border
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Q2. Difference b/n flexbox and grid
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Flexbox is for one-dimensional layouts, grid is for two-dimensional layouts.
• Flexbox is best for arranging items in a single row or column.

• Grid is best for creating complex layouts with rows and columns.

• Flexbox is more suitable for smaller scale layouts, while grid is better for larger scale layouts.

• Flexbox is more flexible in terms of item order and sizing, while grid provides more control over the overall layout.

• Both
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