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I applied via Naukri.com and was interviewed in Jun 2023. There were 3 interview rounds.
Promises, event looping, hoisting, and React concepts are important topics in JavaScript development.
Promises are used for asynchronous programming in JavaScript, allowing for better handling of asynchronous operations.
Event looping is the process by which JavaScript handles asynchronous tasks by placing them in a queue and executing them in a specific order.
Hoisting is a JavaScript mechanism where variables and functi...
Yes, as a React JS Developer, I may work on both front end and backend development tasks.
As a React JS Developer, I may be required to work on both front end and backend tasks depending on the project requirements.
I may need to collaborate with backend developers to integrate front end components with backend services.
Having knowledge of backend technologies like Node.js or Express can be beneficial for a React JS Deve
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I applied via Recruitment Consultant and was interviewed in Apr 2021. There were 3 interview rounds.
I applied via Naukri.com and was interviewed in Oct 2024. There were 2 interview rounds.
I applied via Recruitment Consultant
Hooks are a new feature in React 16.8 that allow you to use state and other React features without writing a class.
Hooks are functions that let you use state and other React features in functional components.
They allow you to reuse stateful logic without changing your component hierarchy.
Some built-in hooks include useState, useEffect, useContext, etc.
Hooks provide a more direct API to the React concepts you already kn...
Pure component is a class component that does not re-render if the input props and state remain the same.
Pure components implement shouldComponentUpdate method with shallow prop and state comparison.
They are optimized for performance as they prevent unnecessary re-renders.
Example: class MyComponent extends React.PureComponent { // component code here }
Modules in JavaScript are reusable pieces of code that can be exported from one file and imported into another.
Modules help in organizing code into separate files for better maintainability.
Modules can be imported using 'import' keyword and exported using 'export' keyword.
Modules can be used to encapsulate code and prevent global namespace pollution.
CommonJS and ES6 modules are two popular module systems in JavaScript.
rem and em are both units in CSS for defining font sizes, with rem being relative to the root element and em being relative to the parent element.
rem stands for 'root em' and is relative to the font size of the root element (usually the tag)
em stands for 'element em' and is relative to the font size of the parent element
To hide something in CSS, you can use the display property with a value of 'none' or the visibility...
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I applied via Naukri.com and was interviewed in Jun 2024. There was 1 interview round.
Promises are objects representing the eventual completion or failure of an asynchronous operation, while async/await is a syntactic sugar built on top of promises to write asynchronous code in a synchronous manner.
Promises are used to handle asynchronous operations and provide a way to chain multiple asynchronous operations together.
Async/await allows you to write asynchronous code that looks synchronous, making it eas...
useMemo is used for memoizing expensive calculations, while useCallback is used for memoizing functions.
useMemo is used to memoize expensive calculations and only recompute the value when the dependencies change.
useCallback is used to memoize functions and only re-create the function when the dependencies change.
Example: useMemo can be used to memoize the result of a complex computation, while useCallback can be used t...
throw is used to throw an exception, new throw is used to throw an exception with a new object
throw is used to throw an exception in JavaScript
new throw is used to throw an exception with a new object
Example: throw new Error('Something went wrong')
Validation in React can be added using form validation libraries, custom validation functions, or built-in HTML5 validation attributes.
Use form validation libraries like Formik or Yup for easy validation setup
Create custom validation functions to validate input fields based on specific requirements
Utilize built-in HTML5 validation attributes like required, pattern, and min/max for basic validation
Display error messages...
I applied via Naukri.com and was interviewed in Nov 2024. There was 1 interview round.
get props is used to retrieve the value of a property in React components, while set props is used to update the value of a property.
get props is used to access the value of a property passed down from a parent component
set props is used to update the value of a property in the current component
Example: get props - accessing the 'name' prop in a child component: this.props.name
Example: set props - updating the 'count' ...
get forEach is used to iterate over elements in an array without returning a new array, while map creates a new array by applying a function to each element.
forEach does not return a new array, while map returns a new array with the results of applying a function to each element
forEach is used for side effects, while map is used for transforming data
forEach does not return anything, while map returns a new array
Example...
PUT is used to update or replace an entire resource, while PATCH is used to update or modify part of a resource.
PUT is idempotent, meaning multiple identical requests will have the same effect as a single request.
PATCH is not necessarily idempotent, as multiple identical requests may have different effects.
PUT requires the client to send the entire updated resource, while PATCH only requires the client to send the spec...
Local storage is persistent and stays until manually cleared, while session storage is temporary and cleared when the browser is closed.
Local storage data persists even after closing the browser
Session storage data is cleared when the browser is closed
Both store data as key-value pairs similar to cookies
Event loop is a mechanism in JavaScript that allows for asynchronous operations to be executed in a non-blocking way.
Event loop is responsible for handling asynchronous operations in JavaScript.
It allows for non-blocking execution of code by moving asynchronous tasks to the event queue.
Event loop continuously checks the call stack and the event queue, moving tasks from the queue to the stack when the stack is empty.
Exa...
Closures are functions that have access to their own scope, as well as the scope in which they were defined.
Closures allow functions to access variables from their outer scope even after the outer function has finished executing.
They are commonly used to create private variables in JavaScript.
Closures are created whenever a function is defined within another function.
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