Webskitters Interview Questions and Answers

Aptitude Test was quite easy. I had to solve some functions.

Q1. How to set dinamic cell height of a Tableview
Ans. 
Set dynamic cell height in a TableView by implementing UITableViewDelegate method heightForRowAt
• Implement UITableViewDelegate method heightForRowAt to return the desired height for each cell

• Calculate the height dynamically based on the content of the cell

• Use Auto Layout constraints to define the cell's content and let the system calculate the height
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Q2. Delegate and Datasource methods of the Tableview
Ans. 
Delegate and Datasource methods are used to customize the behavior and appearance of a TableView in iOS development.
• Delegate methods are used to handle user interactions and customize the appearance of TableView cells.

• Datasource methods are used to provide data to the TableView and control its layout.

• Example: UITableViewDelegate method 'didSelectRowAt' is called when a row is selected by the user.

• Example: UITableViewDa...read more
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Q3. How to fetch api thorough Tableview
Ans. 
To fetch API data through TableView, you can use URLSession to make network requests and populate TableView with the fetched data.
• Use URLSession to make API requests and fetch data

• Parse the JSON response and store it in an array or dictionary

• Reload TableView data to display the fetched data

• Handle errors and network connectivity issues appropriately
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I had to design a view controller using figma. Which i was given

Q1. How to fetch data from MongoDB
Ans. 
To fetch data from MongoDB, use the find() method with optional query parameters.
• Use the find() method to retrieve data from a MongoDB collection

• You can pass query parameters to filter the results

• Use the findOne() method to retrieve a single document
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Q2. How node is works
Ans. 
Node.js is a runtime environment that allows you to run JavaScript on the server side.
• Node.js uses an event-driven, non-blocking I/O model, making it lightweight and efficient.

• It is commonly used for building server-side applications, APIs, and real-time applications.

• Node.js is built on the V8 JavaScript engine and uses an event loop to handle asynchronous operations.
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Q3. What is middleware
Ans. 
Middleware is software that acts as a bridge between different applications or components, allowing them to communicate and work together.
• Middleware facilitates communication between different software components

• It can handle tasks such as data transformation, security, and routing

• Examples include message brokers like RabbitMQ, API gateways like Kong, and web servers like Apache Tomcat
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Q4. What is req and res
Ans. 
req and res are commonly used abbreviations for request and response objects in web development.
• req stands for request object, which contains information about the incoming HTTP request from the client.

• res stands for response object, which is used to send back a response to the client based on the request.

• In Node.js, req and res are often used in Express.js framework for handling HTTP requests and responses.
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Q5. How to upload file in server
Ans. 
To upload a file to a server, you can use a form with a file input field or use a server-side script to handle the file upload process.
• Create a form with a file input field in HTML.

• Use a server-side script (e.g. PHP, Node.js) to handle the file upload process.

• Validate the file type and size before uploading.

• Move the uploaded file to a designated folder on the server.

• Provide feedback to the user after the file has been ...read more
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Q6. All about RESTApis
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Q7. Why use mongoose for mongoDB
Ans. 
Mongoose provides a schema-based solution for modeling data in MongoDB, making it easier to work with complex data structures.
• Mongoose simplifies interactions with MongoDB by providing a schema-based solution

• It allows for defining data models with validation rules and relationships between data

• Mongoose also provides middleware functions for pre and post processing of data operations
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Q8. How to use soft delete
Ans. 
Soft delete is a technique used to mark records as deleted without actually removing them from the database.
• Add a 'deleted_at' column to the database table to store the timestamp of when the record was soft deleted

• Update queries to set the 'deleted_at' timestamp when a record is soft deleted

• Modify queries to exclude soft deleted records by checking for 'deleted_at' column being null
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Q9. Oops concept and some es6 related
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Q1. Salary negotiations
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Q1. Fundamental of React.js & JavaScript?
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Q2. Usememo / usecallbak
Ans. 
useMemo and useCallback optimize performance by memoizing values and functions in React components.
• useMemo: Caches the result of a computation to avoid recalculating on every render.

• Example: const memoizedValue = useMemo(() => computeExpensiveValue(a, b), [a, b]);

• useCallback: Returns a memoized version of a callback function that only changes if one of the dependencies has changed.

• Example: const memoizedCallback = u...read more
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Q1. What is event loop in js?
Ans. 
The event loop in JavaScript manages asynchronous operations, allowing non-blocking execution of code.
• JavaScript is single-threaded, meaning it can execute one command at a time.

• The event loop continuously checks the call stack and the message queue.

• When the call stack is empty, the event loop pushes the first message from the queue to the stack for execution.

• Example: setTimeout(() => console.log('Hello'), 1000) add...read more
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Q2. How do you optimize the component rendering in react?
Ans. 
Optimizing component rendering in React enhances performance and user experience by minimizing unnecessary re-renders.
• Use React.memo to prevent re-renders of functional components when props haven't changed.

• Implement shouldComponentUpdate in class components to control rendering based on state or props changes.

• Utilize useCallback and useMemo hooks to memoize functions and values, preventing unnecessary recalculations.

• S...read more
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Q1. All the questions were from angular and javascript
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Q2. One question was from coding
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Q1. Not a specific question .
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It depends

Q1. Your working experience
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