TCS UI UX Developer Interview Questions and Answers for Experienced

Q1. Let var const in JavaScript
Ans. 
var and const are used to declare variables in JavaScript, with var being mutable and const being immutable.
• var is used to declare variables that can be reassigned and updated

• const is used to declare variables that cannot be reassigned or updated

• let is another keyword used for declaring variables, similar to var but with block scope
Answered by AI
Add your answer
Q2. Error boundary and how to handle
Ans. 
Error boundary is a React component that catches JavaScript errors anywhere in a component tree and logs those errors.
• Error boundaries are React components that catch JavaScript errors in their child component tree.

• They are used to prevent the entire UI from crashing due to a single error.

• Error boundaries work like a JavaScript catch {} block, but for components.

• They are defined using componentDidCatch lifecycle method
Answered by AI
Add your answer
Q3. Event.bind and event.property
Add your answer
Q4. Use of never in typescript
Ans. 
The 'never' type in TypeScript represents a value that will never occur.
• Used to indicate that a function will not return a value

• Commonly used in union types to exclude certain values

• Helps catch potential errors at compile time
Answered by AI
Add your answer
Q5. What hooks you have used
Ans. 
I have used React hooks such as useState, useEffect, useContext, and useRef in my projects.
• useState

• useEffect

• useContext

• useRef
Answered by AI
Add your answer
Q6. What is difference between use reducer and use state
Ans. 
useReducer is preferred for managing complex state logic, while useState is simpler for basic state management.
• useReducer is more suitable for managing complex state logic and multiple state values

• useState is simpler and more straightforward for basic state management with a single value

• useReducer allows for more organized and centralized state updates through actions and reducers

• useState is commonly used for simple co
Answered by AI
Add your answer
Q7. Why we use state and props
Add your answer
Q8. How you will pass data from parent to child
Ans. 
Data can be passed from parent to child components in React using props.
• Pass data as props from parent component to child component

• Use state management libraries like Redux or Context API for complex data sharing

• Use callback functions to pass data from child to parent components
Answered by AI
Add your answer
Q9. Write your own custom hook
Ans. 
Custom hook to fetch data from an API
• Create a function that uses the useState and useEffect hooks

• Use the fetch API to make a request to the desired endpoint

• Return the fetched data and loading state in an array
Answered by AI
Add your answer
Q10. Explain map filter and reduce functions
Ans. 
Map, filter, and reduce are higher-order functions in JavaScript used to manipulate arrays.
• Map: Transforms each element in an array and returns a new array with the transformed elements.

• Example: [1, 2, 3].map(num => num * 2) returns [2, 4, 6].

• Filter: Returns a new array with elements that pass a certain condition.

• Example: [1, 2, 3].filter(num => num > 1) returns [2, 3].

• Reduce: Applies a function against an accumulator ...read more
Answered by AI
Add your answer
Q11. How you can clone an object
Ans. 
To clone an object in JavaScript, you can use the spread operator or Object.assign() method.
• Use the spread operator to create a shallow copy of an object: const clonedObj = { ...originalObj };

• Use Object.assign() method to create a shallow copy of an object: const clonedObj = Object.assign({}, originalObj);

• For deep cloning, you can use libraries like Lodash or write a custom function to recursively clone nested objects.
Answered by AI
Add your answer
Q12. What are the three stages of event propagation and how to handle it
Ans. 
Event propagation consists of three stages: capturing, target, and bubbling.
• Capturing phase: Events are captured from the outermost element to the target element.

• Target phase: Event reaches the target element where the event originated.

• Bubbling phase: Events bubble up from the target element to the outermost element.
Answered by AI
Add your answer
Q13. How to handle errors in your react application
Ans. 
Errors in a React application can be handled by using error boundaries, try-catch blocks, and displaying error messages to users.
• Use error boundaries to catch errors in components and display a fallback UI

• Wrap code that may throw errors in try-catch blocks to handle exceptions

• Use libraries like React Error Boundary to easily implement error handling

• Display error messages to users to inform them about the issue and poss
Answered by AI
Add your answer
Q14. Write code to call fake api and display the title where category is “some category “
Add your answer

Q1. What are states and props in React?
Ans. 
States and props are important concepts in React for managing and passing data between components.
• States are mutable data that can be changed within a component

• Props are read-only data passed from parent to child components

• States are managed within a component using setState() method

• Props are accessed using this.props in a component
Answered by AI
Add your answer
Q2. What is Virtual DOM
Ans. 
Virtual DOM is a lightweight copy of the actual DOM that allows for efficient updates and rendering in web applications.
• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing direct manipulation of the actual DOM.

• When changes are made to the virtual DOM, a comparison is done with the actual DOM to determine the minimal updates needed for rendering.

• This process helps reduce the numbe...read more
Answered by AI
Add your answer
Q3. Build a fetch and filter component
Ans. 
A fetch and filter component for data retrieval and manipulation
• Use fetch API to retrieve data from an API endpoint

• Implement a filter function to manipulate the retrieved data based on user input

• Display the filtered data in the UI
Answered by AI
Add your answer

Javascript and React snippets

Q1. React JS and Java script
Add your answer

Q1. Angular lifecycle hooks
Add your answer
Q2. JS interview questions
Add your answer

Recurrsion tree implementation with angular

Excellent and test related which we worked technology only

Q1. What is different between react and angular?
Ans. 
React is a JavaScript library for building user interfaces, while Angular is a full-fledged framework for web development.
• React is a library, while Angular is a framework.

• React uses a virtual DOM for better performance, while Angular uses a regular DOM.

• React is more flexible and allows developers to choose their own tools and libraries, while Angular has a more opinionated structure.

• React is mainly focused on the view ...read more
Answered by AI
Add your answer
Q2. What is props drilling and higher order component in react. ?
Ans. 
Props drilling is passing props through multiple levels of components. Higher order component is a function that takes a component and returns a new component.
• Props drilling involves passing props from a parent component to a deeply nested child component, which can lead to prop pollution and make the code harder to maintain.

• Higher order component is a pattern where a function takes a component and returns a new compon...read more
Answered by AI
Add your answer

Q1. Previous projects domain
Add your answer
Q2. What is role of previous company and some questions related to previous projects
Add your answer

Q1. What is Virtual dom?
Ans. 
Virtual DOM is a lightweight copy of the actual DOM in memory, used for efficient updates and rendering in web development.
• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing actual DOM manipulations.

• When changes are made to the UI, the virtual DOM is updated first, then compared to the actual DOM to determine the minimal changes needed.

• This process helps reduce the number of upd...read more
Answered by AI
Add your answer

Q1. Why should we hire you?
Add your answer

Html,css,javascript,reactjs,php,laravel.bootstrap

Q1. Why we use reactjs? and javascript
Ans. 
ReactJS is used for building interactive user interfaces, while JavaScript is the programming language that powers web development.
• ReactJS allows for component-based architecture, making it easier to manage and update UI elements.

• ReactJS uses a virtual DOM for efficient rendering, improving performance.

• JavaScript is the language used to add interactivity and dynamic behavior to web pages.

• JavaScript is essential for cli...read more
Answered by AI
Add your answer
Q2. This is use fro single page web aplication or real time.
Add your answer

Q1. Tell me about ut self, some accounts questions
Add your answer
Q2. College qualification
Add your answer
Q3. Communication knowledge
Add your answer
Q4. Family background
Add your answer
Q5. Why should I hire you
Add your answer
Q6. What is your Goals
Add your answer
Q7. Any ideas for our company background
Add your answer
Q8. Knowledge check
Add your answer