10+ Interview Questions and Answers

Arrow functions are more concise and have lexical scoping, while normal functions have their own 'this' value.

• Arrow functions do not have their own 'this' value, they inherit it from the parent scope.

• Arrow functions are more concise and have implicit return.

• Normal functions are more flexible and can be used as constructors.

• Arrow functions cannot be used as constructors.

• Arrow functions do not have 'arguments' object.

Convert a counter code from class component to functional component

• Use useState hook to manage state in functional component

• Remove 'this' keyword and constructor from the code

• Update event handlers to use arrow functions or useCallback hook

Code snippet to post data to a public URL in React

• Use the fetch API to make a POST request to the public URL

• Convert the data to JSON before sending it in the request body

• Handle the response from the server accordingly

Map two arrays of objects and display results in lists using React

• Use the map function to iterate over each array of objects

• Render the results in separate lists using JSX

• Example: array1.map(item =>

• {item.name}
)

CORS stands for Cross-Origin Resource Sharing and is a security feature implemented by browsers to prevent unauthorized access to resources on a different domain.

• CORS allows servers to specify who can access their resources by adding specific HTTP headers to their responses.

• It is used to protect against cross-site request forgery (CSRF) attacks.

• For example, if a frontend application on domain A tries to make a request to a backend API on domain B, CORS will block the request ...read more

Call stack stores function calls and local variables, while heap stores dynamic memory allocation.

• Call stack is used for function calls and local variables

• Heap is used for dynamic memory allocation

• Call stack is limited in size and has a fixed memory allocation, while heap is larger and can grow dynamically

• Example: Call stack is used to keep track of function calls in a recursive function, while heap is used to allocate memory for objects

Find the length of the longest increasing subsequence in an array.

• Use dynamic programming to keep track of the longest increasing subsequence ending at each index.

• Iterate through the array and update the longest increasing subsequence length for each index.

• Return the maximum length found in the dynamic programming array.

Linux commands commonly used in DevOps for automation and system management.

• 1. ls - List directory contents

• 2. cd - Change directory

• 3. pwd - Print working directory

• 4. mkdir - Make directory

• 5. rm - Remove files or directories

• 6. cp - Copy files or directories

• 7. mv - Move files or directories

• 8. grep - Search text patterns

• 9. ps - Display process information

• 10. top - Display and update sorted information about processes

• 11. chmod - Change file permissions

• 12. chown - Change file owne...read more

I have 2 years of experience integrating OKTA with various applications.

• Implemented SSO using OKTA for multiple web applications

• Configured user provisioning and deprovisioning with OKTA APIs

• Integrated OKTA with Active Directory for user authentication