Winjit Technologies Interview Questions, Process, and Tips for Experienced

Q1. What are Promises
Ans. 
Promises are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used in JavaScript to handle asynchronous operations.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and .catch() to handle errors.

• Example: Fetching data from an API returns a Promise that resolves with the data or rejects with an erro
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Q2. Is Node.js Single Threaded or Multiple Threaded
Ans. 
Node.js is single threaded, but uses multiple threads for I/O operations.
• Node.js uses a single thread to handle all JavaScript code execution.

• It uses multiple threads from a thread pool to handle I/O operations asynchronously.

• This allows Node.js to handle high concurrency without blocking the main thread.

• Example: When reading a file, Node.js will use a separate thread from the pool to perform the I/O operation.
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Reverse the Array of Strings

Q1. Oops concepts ,programs
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Q1. What is reactjs
Ans. 
ReactJS is a JavaScript library for building user interfaces.
• ReactJS is developed and maintained by Facebook.

• It allows developers to create reusable UI components.

• ReactJS uses a virtual DOM for better performance.

• It follows a component-based architecture.

• ReactJS can be used for building single-page applications.
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Q2. Whats is difference between angular and react
Ans. 
Angular is a full-fledged framework with batteries included, while React is a library focused on UI components.
• Angular is a full-fledged framework with built-in features like routing, forms, and HTTP client.

• React is a library focused on building UI components and managing state.

• Angular uses two-way data binding, while React uses one-way data flow.

• Angular uses TypeScript by default, while React uses JavaScript (or TypeS...read more
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Q1. Pagination based react question
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Q2. JavaScript core concept
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Q1. Explain the Lifecycle of MVC and the deployment process.
Ans. 
MVC lifecycle involves Model, View, and Controller interactions, while deployment ensures the application is live and accessible.
• 1. Model: Represents data and business logic. Example: A User model that interacts with a database.

• 2. View: Displays data to the user. Example: HTML templates rendering user information.

• 3. Controller: Handles user input and updates the model. Example: A login controller processing user creden...read more
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Q2. What is CTE and syntax of same ?
Ans. 
CTE stands for Common Table Expression, a temporary result set in SQL used for complex queries.
• CTE is defined using the WITH clause.

• It can be recursive or non-recursive.

• Example syntax: WITH CTE_Name AS (SELECT column1 FROM table) SELECT * FROM CTE_Name;

• CTEs improve readability and organization of SQL queries.

• They can be referenced multiple times within a query.
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Q3. What is CORS (Cross Origin Resource Sharing) ?
Ans. 
CORS is a security feature that allows restricted resources on a web page to be requested from another domain outside the domain from which the resource originated.
• CORS is implemented via HTTP headers that allow servers to specify who can access their resources.

• For example, a web application on 'example.com' can request resources from 'api.example.com' if CORS is enabled.

• The 'Access-Control-Allow-Origin' header is cruc...read more
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Q4. What is Bundling and Minification ?
Ans. 
Bundling and minification optimize web assets by reducing file size and number of requests, improving load times and performance.
• Bundling combines multiple files (e.g., JavaScript, CSS) into a single file to reduce HTTP requests.

• Minification removes unnecessary characters (like whitespace and comments) from code to decrease file size.

• Example of bundling: Combining 'script1.js', 'script2.js', and 'script3.js' into 'bund...read more
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Q5. What is HTML helper ?
Ans. 
HTML helpers are functions that simplify the generation of HTML markup in web applications, enhancing code readability and maintainability.
• HTML helpers are often used in MVC frameworks to generate HTML elements easily.

• Common HTML helpers include methods for creating forms, links, and other UI components.

• Example: In ASP.NET MVC, Html.TextBoxFor() generates an input element for a model property.

• HTML helpers promote DRY (...read more
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Q1. MVC related question
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Q2. SQL related question
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