SkilloVilla Front end Developer Interview Questions and Answers

Question are very tough and faad

Question like trees linked list and graphs

HTML CSS BOOTSTRAP JAVASCRIPT

Q1. Tell About Your Self.
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Q2. What are your strength
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Q3. Consider the type of interview you can expect
Ans. 
A face-to-face interview or Online interview
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Q4. Why did you decide to apply for this position?
Ans. 
'I see the role as a way of developing my career in a forward-thinking/well-established company/industry as…' 'I feel I will succeed in the role because I have experience in/softs skills that demonstrate/ I've taken this course believe my skills are well-suited to this job .
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Q5. Why do you want to work here?
Ans. 
“I see this opportunity as a way to contribute to an exciting/forward-thinking/fast-moving company/industry,
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GD can be divided into 3 categories

Q1. What is denbouncer and throttle
Ans. 
Debouncer and throttle are techniques used to limit the frequency of function calls.
• Debouncing delays the execution of a function until a certain amount of time has passed without the function being called again.

• Throttling limits the frequency of function calls to a certain rate, executing the function at fixed intervals.

• Debouncing is useful for events that may be triggered multiple times in quick succession, such as r...read more
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Q2. What is curry function
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Currying is a technique of transforming a function that takes multiple arguments into a sequence of functions that each take a single argument.
• Currying allows partial application of a function

• It helps in creating reusable functions

• Curried functions are easier to compose and chain

• Example: const add = (a) => (b) => a + b; add(2)(3) returns 5
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Q3. Implement curry function
Ans. 
Curry function is a higher-order function that allows partial application of arguments.
• Currying transforms a function that takes multiple arguments into a series of functions that take one argument each.

• It returns a new function until all the arguments are received and then executes the original function.

• Example: const add = (a, b) => a + b; const curriedAdd = curry(add); curriedAdd(2)(3) returns 5.
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Q4. What is promise.all()
Ans. 
promise.all() is a method that takes an array of promises and returns a new promise that resolves when all promises in the array have resolved.
• It is used to handle multiple asynchronous operations simultaneously.

• If any of the promises in the array rejects, the returned promise will be rejected with the reason of the first rejected promise.

• The resolved values of the promises are returned as an array in the same order as
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Q5. What is memoization?
Ans. 
Memoization is a technique of caching the results of a function to improve performance.
• Memoization is used to avoid redundant calculations by storing the results of a function and returning the cached result when the same inputs occur again.

• It is commonly used in recursive functions and functions with expensive computations.

• Memoization can be implemented manually or by using libraries like Lodash or Memoizee.

• Example: M...read more
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Q6. What is closure in javascript
Ans. 
Closure is a function that has access to its parent scope even after the parent function has returned.
• Closure allows for private variables and functions in JavaScript.

• It is created when a function returns another function.

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

• Example: function outer() { let x = 10; return function inner() { console.log(x); } }

• The inner function can access and mo...read more
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Q7. What is the problem with colosures
Ans. 
Closures can cause memory leaks if not handled properly.
• Closures can hold references to variables outside of their scope, preventing them from being garbage collected.

• If closures are used excessively or not released properly, they can cause memory leaks.

• To avoid memory leaks, make sure to release closures when they are no longer needed.
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Q8. Some output questions on SetTimeout to check closure knowledge
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Q9. React lifecycle events
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Q10. Major difference between class based components and class based components
Ans. 
There is no difference between class based components and class based components.
• There seems to be a typo in the question.

• Assuming the question is about functional components vs class components, the major difference is that class components use a class to define the component while functional components are defined as functions.

• Class components have access to lifecycle methods while functional components do not.

• Functi...read more
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Q11. Shallow copy vs deep copy
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Shallow copy only copies the reference to an object while deep copy creates a new object with a new memory address.
• Shallow copy is faster and uses less memory than deep copy.

• In shallow copy, changes made to the original object will reflect in the copied object as well.

• Deep copy creates a completely new object with its own memory space.

• In JavaScript, arrays and objects are assigned by reference, so a shallow copy will o...read more
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Q12. How to do deep copy ?
Ans. 
Deep copy creates a new object with the same values as the original object.
• Use Object.assign() method to create a deep copy of an object.

• For nested objects, use recursion to copy all levels.

• For arrays, use slice() method to create a new array with the same values.

• Avoid using spread operator for deep copy as it only creates a shallow copy.
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Q13. What is hoisting? Some questions on it
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In coding questions.

Q1. Basics of technical questions
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Q2. About my self and my skills related
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Q3. What is HTML, and what is its role in web development?
Ans. 
HTML stands for Hypertext Markup Language and is the standard markup language for creating web pages.
• HTML is used to structure content on the web by using a series of elements and tags.

• It provides the basic building blocks for creating websites, such as headings, paragraphs, images, links, and forms.

• HTML works in conjunction with CSS (Cascading Style Sheets) and JavaScript to create visually appealing and interactive w...read more
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Q4. Explain the basic structure of an HTML document.
Ans. 
The basic structure of an HTML document includes the doctype declaration, html element, head element, and body element.
• DOCTYPE declaration specifies the version of HTML being used

• HTML element wraps the entire content of the document

• Head element contains meta information about the document

• Body element contains the visible content of the document
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Q5. What is the purpose of HTML tags and attributes?
Ans. 
HTML tags and attributes are used to structure and define content on a web page.
• HTML tags are used to define different elements on a web page, such as headings, paragraphs, images, links, etc.

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

• For example, the <img> tag is used to display an image on a web page, and the 'src' attribute specifies the image
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Basics of html and css

Q1. How was the importance of html.
Ans. 
HTML is a fundamental language for creating web pages and is essential for structuring content on the internet.
• HTML stands for HyperText Markup Language

• It is used to create the structure of web pages by using elements like headings, paragraphs, images, links, etc.

• HTML is the backbone of web development and is essential for creating accessible and user-friendly websites
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Q2. How was the importance of css.
Ans. 
CSS is crucial for styling and formatting web pages, enhancing user experience and creating visually appealing designs.
• CSS is used to control the layout, colors, fonts, and overall appearance of a website.

• It allows for responsive design, making websites adapt to different screen sizes and devices.

• CSS can be used to create animations, transitions, and interactive elements on a webpage.

• Without CSS, web pages would be pla...read more
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Q3. What is the Html and css.
Ans. 
HTML and CSS are the building blocks of web development, used to create and style web pages.
• HTML stands for HyperText Markup Language and is used to structure content on a web page.

• CSS stands for Cascading Style Sheets and is used to style the content created with HTML.

• HTML uses tags to define elements like headings, paragraphs, images, and links.

• CSS allows for styling elements with properties like color, font size, ma...read more
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Q4. What is the DOCTYPE declaration in HTML, and why is it important
Ans. 
DOCTYPE declaration 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 informs the web browser about the version of HTML being used, which helps in rendering the page correctly.

• It also helps in triggering the browser's standards mode, ensuring consistent display across different browsers.

• Example: <!DO...read more
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Q5. How can you include external CSS and JavaScript files in an HTML document.
Ans. 
External CSS and JavaScript files can be included in an HTML document using the <link> and <script> tags.
• Use the <link> tag with the 'rel' attribute set to 'stylesheet' to include external CSS files.

• Use the <script> tag with the 'src' attribute to include external JavaScript files.

• Make sure to specify the correct file path in the 'href' attribute for CSS files and 'src' attribute for JavaScript
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Round duration - 45 Minutes
Round difficulty - Medium

It was in the mid day and since I applied for a Frontend role the discussion was majorly around data structure and bit of Javascript.
The interviewer was helping and good listener.

Q1. 
Merge Two Sorted Linked Lists Problem Statement
You are provided with two sorted linked lists. Your task is to merge them into a single sorted linked list and return the head of the combined linked list.
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Ans. 
Merge two sorted linked lists into a single sorted linked list without using additional space.
• Create a dummy node to start the merged list

• Compare the values of the two linked lists and add the smaller value to the merged list

• Move the pointer of the merged list and the pointer of the smaller value list

• Continue this process until one of the lists is fully traversed

• Append the remaining elements of the other list to the me
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Q2. 
Sort 0 1 2 Problem Statement
Given an integer array arr of size 'N' containing only 0s, 1s, and 2s, write an algorithm to sort the array.
Input:
The first line contains an integer 'T' representing the n...read more
Ans. 
Sort an array of 0s, 1s, and 2s in linear time complexity.
• Use three pointers to keep track of 0s, 1s, and 2s while traversing the array.

• Swap elements based on the values encountered to sort the array in-place.

• Time complexity should be O(N) and space complexity should be O(1).
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Round duration - 60 Minutes
Round difficulty - Medium

It was more of a in depth round on the framework I'm working on and problem solving.

Q1. What is the event loop and what is its significance?
Ans. 
The event loop is a mechanism in programming that allows for asynchronous execution of code.
• The event loop is a key component in JavaScript's runtime environment, responsible for handling asynchronous operations.

• It continuously checks the call stack for any pending tasks and executes them in a non-blocking manner.

• The event loop ensures that the program remains responsive by allowing other code to run while waiting for ...read more
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Q2. Can you provide examples of output-based questions in JavaScript that utilize browser APIs?
Ans. 
Output-based questions in JavaScript using browser APIs
• Example 1: Write a script that uses the Geolocation API to display the user's current location on a map

• Example 2: Create a program that uses the Web Audio API to play a sound when a button is clicked

• Example 3: Develop a web page that uses the Canvas API to draw a simple animation
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Q3. How would you design a system to support localization in a mobile app?
Ans. 
Designing a system to support localization in a mobile app
• Use resource files to store localized strings for different languages

• Implement a language selection feature for users to choose their preferred language

• Utilize localization libraries or frameworks to streamline the process

• Consider cultural differences when localizing content, such as date formats and currency symbols
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Round duration - 75 Minutes
Round difficulty - Hard

It was more of a fitment/managerial round.
Didn't had any coding questions, but was asked more on approaches and optimisations.
Discussions on the project you have worked on.

Q1. You need to find the fastest 3 horses out of a group, given that you can only race 5 horses at a time. How would you approach this problem?
Ans. 
To find the fastest 3 horses out of a group with 5 horses racing at a time, we can use a tournament style approach.
• Divide the horses into groups of 5 and race them against each other. This will give you the fastest horse in each group.

• Take the winners from each group and race them against each other. The top 3 horses in this final race will be the fastest 3 overall.

• Keep track of the results and compare the timings to d
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Q2. How do you debug the root cause of lag on a screen?
Ans. 
To debug lag on a screen, analyze code, check for memory leaks, optimize rendering, and use profiling tools.
• Analyze code to identify any inefficient algorithms or operations causing lag.

• Check for memory leaks that could be impacting performance.

• Optimize rendering by reducing the number of draw calls, optimizing shaders, and minimizing overdraw.

• Use profiling tools like Xcode Instruments or Android Profiler to identify p
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Q3. Can you explain the architecture of the app you have recently worked on?
Ans. 
The app I recently worked on is a social media platform for sharing photos and connecting with friends.
• The app follows a client-server architecture, with the client being the mobile app and the server handling data storage and processing.

• The client side is built using React Native for cross-platform compatibility.

• The server side is implemented using Node.js with a MongoDB database for storing user data and photos.

• The a...read more
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